CLASS B STOCK PURCHASE WARRANT To Purchase _______________ Shares of Common Stock of VITRO DIAGNOSTICS, INC.

NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF HAVE BEEN REGISTERED WITH THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION (THE "COMMISSION") OR THE SECURITIES COMMISSION OF ANY STATE PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER REGULATION D PROMULGATED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT").  NEITHER THIS WARRANT NOR THE SHARES  ISSUABLE UPON EXERCISE HEREOF MAY BE SOLD, PLEDGED, TRANSFERRED OR ASSIGNED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND UNDER APPLICABLE STATE SECURITIES LAWS, OR IN A TRANSACTION WHICH IS EXEMPT FROM REGISTRATION UNDER THE PROVISIONS OF THE SECURITIES ACT AND UNDER PROVISIONS OF APPLICABLE STATE SECURITIES LAWS.

CLASS B STOCK PURCHASE WARRANT

To Purchase _______________ Shares of Common Stock of

VITRO DIAGNOSTICS, INC.

THIS CERTIFIES that, for value received, _________________________________, or assigns (the "Holder"), is entitled, upon the terms and subject to the conditions hereinafter set forth, at any time on or after the date of issuance of this Warrant (the "Initial Exercise Date") and on or prior to the close of business on _____________________, 2008 (the "Termination Date") unless sooner terminated in accordance with the Agreement as hereinbelow defined but not thereafter, to subscribe for and purchase from Vitro Diagnostics, Inc., a Nevada corporation (the "Company"), up to ______________________________ (_______________) shares (the "Warrant Shares") of Common Stock, $.001 par value per share of the Company (the "Common Stock").  The purchase price of one share of Common Stock (the "Exercise Price") under this Warrant shall be $0.25. The Exercise Price and the number of shares for which the Warrant is exercisable shall be subject to adjustment as provided herein.

Upon exercise of this Warrant, the Company shall grant and issue to the Holder Class C Warrants exercisable until _____________ to purchase an additional ______________ shares of Common Stock at an exercise price of $0.25 per share.

1.

Title of Warrant.  Prior to the expiration hereof and subject to compliance with applicable laws, this Warrant and all rights hereunder are transferable, in whole or in part, at the office or agency of the Company by the holder hereof in person or by duly authorized attorney, upon surrender of this Warrant together with the Assignment Form annexed hereto properly endorsed.

2.

Authorization of Shares.  The Company covenants that all shares of Common Stock which may be issued upon the exercise of rights represented by this Warrant will, upon exercise of the rights represented by this Warrant, be duly authorized, validly issued, fully paid and nonassessable and free from all taxes, liens and charges in respect of the issue thereof (other than taxes in respect of any transfer occurring contemporaneously with such issue).

3.

Exercise of Warrant.  

(a)

Except as provided in Section 4 herein, exercise of the purchase rights represented by this Warrant may be made at any time or times on or after the Initial Exercise Date, and before the close of business on the Termination Date, or such earlier date on which this Warrant

may terminate as provided elsewhere in this Warrant, by the surrender of this Warrant and the Notice of Exercise Form annexed hereto duly executed, at the office of the Company (or such other office or agency of the Company as it may designate by notice in writing to the registered holder hereof at the address of such holder appearing on the books of the Company) and upon payment of the Exercise Price of the shares thereby purchased in the manner provided for herein, the holder of this Warrant shall be entitled to receive a certificate for the number of shares of Common Stock so purchased. Certificates for shares purchased hereunder shall be delivered to the holder hereof within three (3) business days after the date on which this Warrant shall have been exercised as aforesaid. This Warrant shall be deemed to have been exercised and such certificate or certificates shall be deemed to have been issued, and Holder or any other person so designated to be named therein shall be deemed to have become a holder of record of such shares for all purposes, as of the date the Warrant has been exercised by payment to the Company of the Exercise Price and all taxes required to be paid by Holder, if any, pursuant to Section 5 prior to the issuance of such shares, have been paid.  If this Warrant shall have been exercised in part, the Company shall, at the time of delivery of the certificate or certificates representing Warrant Shares, deliver to Holder a new Warrant evidencing the rights of Holder to purchase the unpurchased shares of Common Stock called for by this Warrant, which new Warrant shall in all other respects be identical with this Warrant.

(b)

Notwithstanding any other provision hereof, in no event (except (i) as specifically provided herein as an exception to this provision, or (ii) while there is outstanding a tender offer for any or all of the shares of the Company’s Common Stock) shall the Holder be entitled to exercise any portion of this Warrant, or shall the Company have the obligation to accept the exercise of such Warrant (and the Company shall not have the right to pay interest hereon in shares of Common Stock) to the extent that, after such exercise or issuance of stock in payment of interest, the sum of (1) the number of shares of Common Stock beneficially owned by the Holder and its affiliates (other than shares of Common Stock which may be deemed beneficially owned through the ownership of the unexercised portion of the Warrants or other convertible securities or of the unexercised portion of other options or warrants or other rights to purchase Common Stock), and (2) the number of shares of Common Stock issuable upon the exercise of the Warrants with respect to which the determination of this proviso is being made, would result in beneficial ownership by the Holder and its affiliates of more than 4.99% of the outstanding shares of Common Stock (after taking into account the shares to be issued to the Holder upon such conversion).  For purposes of the proviso to the immediately preceding sentence, beneficial ownership shall be determined in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended, except as otherwise provided in clause (1) of such sentence.  The Holder, by its acceptance of this Warrant, further agrees that if the Holder transfers or assigns any of the Warrants to a party who or which would not be considered such an affiliate, such assignment shall be made subject to the transferee’s or assignee’s specific agreement to be bound by the provisions of this Section 3(b) as if such transferee or assignee were the original Holder hereof.  Nothing herein shall preclude the Holder from disposing of a sufficient number of other shares of Common Stock beneficially owned by the Holder so as to thereafter permit the continued exercise of this Warrant.

4.

Manner of Payment.  The exercise price of each Warrant shall be paid in cash, certified funds or wire transfer at the time the Warrant is exercised.

5.

No Fractional Shares or Scrip.  No fractional shares or scrip representing fractional shares shall be issued upon the exercise of this Warrant.  As to any fraction of a share which Holder would otherwise be entitled to purchase upon such exercise, the Company shall pay a cash adjustment in respect of such final fraction in an amount equal to the Exercise Price.

6.

Charges, Taxes and Expenses.  Issuance of certificates for shares of Common Stock upon the exercise of this Warrant shall be made without charge to the holder hereof for any issue or transfer tax or other incidental expense in respect of the issuance of such certificate, all of which taxes and expenses shall be paid by the Company, and such certificates shall be issued in the name of the holder of this Warrant or in such name or names as may be directed by the holder of this Warrant; provided, however, that in the event certificates for shares of Common Stock are to be issued in a name other than the name of the holder of this Warrant, this Warrant when surrendered for exercise shall be accompanied by the Assignment Form attached hereto duly executed by the holder hereof; and provided further, that upon any transfer involving the issuance or delivery of any certificates for shares of Common Stock, the Company may require, as a condition thereto, the payment of a sum sufficient to reimburse it for any transfer tax incidental thereto.

7.

Closing of Books.  The Company will not close its shareholder books or records in any manner which prevents the timely exercise of this Warrant.

8.

Transfer, Division and Combination.

(a)

Subject to compliance with any applicable securities laws (including the provision to the Company of an opinion of counsel for the assignor of this Warrant), transfer of this Warrant and all rights hereunder, in whole or in part, shall be registered on the books of the Company to be maintained for such purpose, upon surrender of this Warrant at the principal office of the Company, together with a written assignment of this Warrant substantially in the form attached hereto duly executed by Holder or its agent or attorney and funds sufficient to pay any transfer taxes payable upon the making of such transfer.  Upon such surrender and, if required, such payment, the Company shall execute and deliver a new Warrant or Warrants in the name of the assignee or assignees and in the denomination specified in such instrument of assignment, and shall issue to the assignor a new Warrant evidencing the portion of this Warrant not so assigned, and this Warrant shall promptly be cancelled.  A Warrant, if properly assigned, may be exercised by a new Holder for the purchase of shares of Common Stock without having a new Warrant issued.

(b)

This Warrant may be divided or combined with other Warrants upon presentation hereof at the aforesaid office of the Company, together with a written notice specifying the names and denominations in which new Warrants are to be issued, signed by Holder or its agent or attorney.  Subject to compliance with Section 8(a), as to any transfer which may be involved in such division or combination, the Company shall execute and deliver a new Warrant or Warrants in exchange for the Warrant or Warrants to be divided or combined in accordance with such notice.

(c)

The Company shall prepare, issue and deliver at its own expense (other than transfer taxes) the new Warrant or Warrants under this Section 7.

(d)

The Company agrees to maintain, at its aforesaid office, books for the registration and the registration of transfer of the Warrants.

9.

No Rights as Shareholder until Exercise.  This Warrant does not entitle the holder hereof to any voting rights or other rights as a shareholder of the Company prior to the exercise hereof.  Upon the surrender of this Warrant and the payment of the aggregate Exercise Price, the Warrant Shares so purchased shall be and be deemed to be issued to such holder as the record owner of such shares as of the close of business on the later of the date of such surrender or payment.

10.

Loss, Theft, Destruction or Mutilation of Warrant.  The Company represents and warrants that upon receipt by the Company of evidence reasonably satisfactory to it of the loss, theft, destruction or mutilation of this Warrant certificate or any stock certificate relating to the Warrant Shares, and in case of loss, theft or destruction, of indemnity or security reasonably satisfactory to it, and upon surrender and cancellation of such Warrant or stock certificate, if mutilated, the Company will make and deliver a new Warrant or stock certificate of like tenor and dated as of such cancellation, in lieu of such Warrant or stock certificate.

11.

Saturdays, Sundays, Holidays, etc.  If the last or appointed day for the taking of any action or the expiration of any right required or granted herein shall be a Saturday, Sunday or a legal holiday, then such action may be taken or such right may be exercised on the next succeeding day not a Saturday, Sunday or legal holiday.

12.

Adjustments of Exercise Price and Number of Warrant Shares.

(a)

Stock Splits, etc. The number and kind of securities purchasable upon the exercise of this Warrant and the Exercise Price shall be subject to adjustment from time to time upon the happening of any of the following.  In case the Company shall (i) pay a dividend in shares of Common Stock or make a distribution in shares of Common Stock to holders of its outstanding Common Stock, (ii) subdivide its outstanding shares of Common Stock into a greater number of shares of Common Stock, (iii) combine its outstanding shares of Common Stock into a smaller number of shares of Common Stock or (iv) issue any shares of its capital stock in a reclassification of the Common Stock, then the number of Warrant Shares purchasable upon exercise of this Warrant immediately prior thereto shall be adjusted so that the holder of this Warrant shall be entitled to receive the kind and number of Warrant Shares or other securities of the Company which he would have owned or have been entitled to receive had such Warrant been exercised in advance thereof.  Upon each such adjustment of the kind and number of Warrant Shares or other securities of the Company which are purchasable hereunder, the holder of this Warrant shall thereafter be entitled to purchase the number of Warrant Shares or other securities resulting from such adjustment at an Exercise Price per such Warrant Share or other security obtained by multiplying the Exercise Price in effect immediately prior to such adjustment by the number of Warrant Shares purchasable pursuant hereto immediately prior to such adjustment and dividing by the number of Warrant Shares or other securities of the Company resulting from such adjustment.  An adjustment made pursuant to this paragraph shall become effective immediately after the effective date of such event retroactive to the record date, if any, for such event.

(b)

Reorganization, Reclassification, Merger, Consolidation or Disposition of Assets.  In case the Company shall reorganize its capital, reclassify its capital stock, consolidate or merge with or into another corporation (where the Company is not the surviving corporation or where there is a change in or distribution with respect to the Common Stock of the Company), or sell, transfer or otherwise dispose of all or substantially all its property, assets or business to another corporation and, pursuant to the terms of such reorganization, reclassification, merger, consolidation or disposition of assets, shares of common stock of the successor or acquiring corporation, or any cash, shares of stock or other securities or property of any nature whatsoever (including warrants or other subscription or purchase rights) in addition to or in lieu of common stock of the successor or acquiring corporation ("Other Property"), are to be received by or distributed to the holders of Common Stock of the Company, then the holder of this Warrant shall have the right thereafter to receive, upon exercise of this Warrant, the number of shares of common stock of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and Other Property receivable upon or as a result of such reorganization, reclassification, merger, consolidation or disposition of assets by a holder of the number of shares of Common Stock for which this Warrant is exercisable immediately prior to such event.  In case of any such reorganization, reclassification, merger, consolidation or disposition of assets, the successor or acquiring corporation (if other than the Company) shall expressly assume the due and punctual observance and performance of each and every covenant and condition of this Warrant to be performed and observed by the Company and all the obligations and liabilities hereunder, subject to such modifications as may be deemed appropriate (as determined by resolution of the Board of Directors of the Company) in order to provide for adjustments of shares of Common Stock for which this Warrant is exercisable which shall be as nearly equivalent as practicable to the adjustments provided for in this Section 12.  For purposes of this Section 12, "common stock of the successor or acquiring corporation" shall include stock of such corporation of any class which is not preferred as to dividends or assets over any other class of stock of such corporation and which is not subject to redemption and shall also include any evidences of indebtedness, shares of stock or other securities which are convertible into or exchangeable for any such stock, either immediately or upon the arrival of a specified date or the happening of a specified event and any warrants or other rights to subscribe for or purchase any such stock.  The foregoing provisions of this Section 12 shall similarly apply to successive reorganizations, reclassifications, mergers, consolidations or disposition of assets.

(c)

Anti-Dilution Provisions.

(i)

Adjustments of Exercise Price.  If prior to the expiration of this Warrant by exercise or by its terms, the Company should issue or sell any shares of Common Stock or declare a stock dividend to shareholders for a consideration per share less than the Exercise Price in effect immediately prior to the time of such issue or sale, (the “Lower Price”), then forthwith upon such issue or sale, the Exercise Price shall be reduced to a price equal to the Lower Price.

(ii)

Adjustment for Dividends.  In the event the Company shall make or issue, or shall have issued, or shall fix a record date for the determination of holders of common stock entitled to receive a dividend or the distribution (other than a distribution otherwise provided for herein) payable in (a) securities of the Company other than shares of Common Stock or (b) assets (including cash paid or payable out of capital or capital surplus or surplus created as a result of a revaluation of property, but excluding the cumulative dividends payable with respect to an authorized

series of Preferred Stock), then and in each such event provision shall be made so that the holders of Warrants shall receive upon exercise thereof in addition to the number of shares of Common Stock receivable thereupon, the number of securities or such other assets of the Company which they would have received had their Warrants been exercised into Common Stock on the date of such event and had they thereafter, during the period from the date of such event to and including the exercise date, retained such securities or such other assets receivable by them as aforesaid during such period, giving application to all adjustments called for during such period under this paragraph  with respect to Warrrantholders.

(iii)

Adjustment for Capital Reorganization or Reclassification.  If the common stock issuable upon the exercise of the Warrants shall be changed into the same or different number of shares of any class or classes of stock, whether by capital reorganization, reclassification or otherwise then and in each such event the holder of the Warrants shall have the right thereafter to exercise such Warrants and receive the kind an amount of shares of stock and other securities and property receivable upon such reorganization, reclassification or other change by holders of the number of shares of common stock into which such Warrant might have been exercised immediately prior to such reorganization, reclassification or change, all subject to further adjustment as provided herein.

(iv)

Convertible Securities.  For the purpose of the adjustment provided for in section (i) of this Paragraph 12, if at any time or from time to time after the date of this Warrant the Company shall issue any rights or options for the purchase of, or stock or other securities convertible into, additional shares of Common Stock (such convertible stock or securities being hereafter referred to as "Convertible Securities,") then such event, in the absence of the exercise or conversion of the Convertible Securities into additional shares of Common Stock, shall not result in any adjustment in the exercise price of this Warrant.  Rather, an adjustment in the exercise price of this Warrant shall occur if, and only if, the Convertible Security is converted or exercised to acquire additional shares of Common Stock, in which event the conversion value or exercise price of the Convertible Securities shall be treated as the consideration per share received by the Company for such security for the purposes of determining the adjustment provided for in subsection (i) of this paragraph 12.

(v)

Adjustment of Number of Shares.  Anything in this Certificate to the contrary notwithstanding, in case the Company shall at any time issue Common Stock or Convertible Securities by way of dividend or other distribution on any stock of the Company or subdivide or combine the outstanding shares of Common Stock, the Exercise Price shall be proportionately decreased in the case of such issuance (on the day following the date fixed for determining shareholders entitled to receive such dividend or other distribution) or decreased in the case of such subdivision or increased in the case of such combination (on the date that such subdivision or combination shall become effective).

(vi)

No Adjustment for Small Amounts.  Anything in this paragraph to the contrary notwithstanding, the Company shall not be required to give effect to any adjustment in the Exercise Price unless and until the net effect of one or more adjustments, determined as above provided, shall have required a change of the Exercise Price by at least one cent, but when the

cumulative net effect of more than one adjustment so determined shall be to change the actual Exercise Price by at least one cent, such change in the Exercise Price shall thereupon be given effect.

(vii)

Number of Shares Adjusted.  Upon any adjustment of the Exercise Price, the Holder of this Warrant shall thereafter (until another such adjustment) be entitled to purchase, at the new Exercise Price, the number of shares, calculated to the nearest full share, obtained by multiplying the number of shares of Common Stock initially issuable upon exercise of this Warrant by the Exercise Price in effect on the date hereof and dividing the product so obtained by the new Exercise Price.

(viii)

Common Stock Defined.  Whenever reference is made in this paragraph 12 to the issue or sale of shares of Common Stock, the term "Common Stock" shall mean the Common Stock of the Company of the class authorized as of the date hereof and any other class of stock ranking on a parity with such Common Stock.  However, subject to the provisions of paragraph 12 hereof, shares issuable upon exercise hereof shall include only shares of the class designated as Common Stock of the Company as of the date hereof.

13.

Voluntary Adjustment by the Company.  The Company may at any time during the term of this Warrant, reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by the Board of Directors of the Company.

14.

Notice of Adjustment.  Whenever the number of Warrant Shares or number or kind of securities or other property purchasable upon the exercise of this Warrant or the Exercise Price is adjusted, as herein provided, the Company shall promptly mail by registered or certified mail, return receipt requested, to the holder of this Warrant notice of such adjustment or adjustments setting forth the number of Warrant Shares (and other securities or property) purchasable upon the exercise of this Warrant and the Exercise Price of such Warrant Shares (and other securities or property) after such adjustment, setting forth a brief statement of the facts requiring such adjustment and setting forth the computation by which such adjustment was made.  Such notice, in absence of manifest error, shall be conclusive evidence of the correctness of such adjustment.

15.

Notice of Corporate Action.  If at any time:

(a)

the Company shall take a record of the holders of its Common Stock for the purpose of entitling them to receive a dividend or other distribution, or any right to subscribe for or purchase any evidences of its indebtedness, any shares of stock of any class or any other securities or property, or to receive any other right, or

(b)

there shall be any capital reorganization of the Company, any reclassification or recapitalization of the capital stock of the Company or any consolidation or merger of the Company with, or any sale, transfer or other disposition of all or substantially all the property, assets or business of the Company to, another corporation or,

(c)

there shall be a voluntary or involuntary dissolution, liquidation or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at least 30 days' prior written notice of the record date for such dividend, distribution or right or for determining rights to vote in respect of any such reorganization, reclassification, merger, consolidation, sale, transfer, disposition, liquidation or winding up, and (ii) in the case of any such reorganization, reclassification, merger, consolidation, sale, transfer, disposition, dissolution, liquidation or winding up, at least 30 days' prior written notice of the date when the same shall take place.  Such notice in accordance with the foregoing clause also shall specify (i) the date on which the holders of Common Stock shall be entitled to any such dividend, distribution or right, and the amount and character thereof, and (ii) the date on which any such reorganization, reclassification, merger, consolidation, sale, transfer, disposition, dissolution, liquidation or winding up is to take place and the time, if any such time is to be fixed, as of which the holders of Common Stock shall be entitled to exchange their shares of Common Stock for securities or other property deliverable upon such disposition, dissolution, liquidation or winding up.  Each such written notice shall be sufficiently given if addressed to Holder at the last address of Holder appearing on the books of the Company and delivered in accordance with Section 17(d).

16.

Authorized Shares.  The Company covenants that during the period the Warrant is outstanding, it will reserve from its authorized and unissued Common Stock a sufficient number of shares to provide for the issuance of the Warrant Shares upon the exercise of any purchase rights under this Warrant.  The Company further covenants that its issuance of this Warrant shall constitute full authority to its officers who are charged with the duty of executing stock certificates to execute and issue the necessary certificates for the Warrant Shares upon the exercise of the purchase rights under this Warrant.  The Company will take all such reasonable action as may be necessary to assure that such Warrant Shares may be issued as provided herein without violation of any applicable law or regulation, or of any requirements of  NASDAQ or any domestic securities exchange upon which the Common Stock may be listed.

NOTICE OF EXERCISE