Common use of Lead Development Party Clause in Contracts

Lead Development Party. The JRDC shall recommend to Sanofi-Aventis the Party that it believes should serve as the lead Party for the conduct of the first Phase I Clinical Trial for each Product. The JRDC’s recommendation shall be made in the best interest of the Collaboration. After careful review of the recommendation of the JRDC, Sanofi-Aventis shall determine which Party shall serve as the lead Party for the conduct of the first Phase I Clinical Trial (the “Lead Development Party”). If Sanofi-Aventis determines that Exelixis serve as the Lead Development Party for a Product, then Exelixis’ responsibility to Develop such Product shall cease after the Transfer Date for the first Phase I Clinical Trial for such Product, and Sanofi-Aventis shall be responsible (as of the Transfer Date) for all further Development of such Product pursuant in Section 3.1. If Sanofi-Aventis is the Lead Development Party for a Product, then Sanofi-Aventis shall be responsible for all Development of such Product pursuant to Sections 3.1, 5.2 and 5.3.

Lead Development Party. The JRDC shall recommend to Sanofi-Aventis the Party that it believes should serve as the lead Party for the conduct of the first Phase I Clinical Trial for each Product. The JRDC’s recommendation shall be made in the best interest of the Collaboration. After careful review of the recommendation of the JRDC, Sanofi-Aventis shall determine which Party shall serve as the lead Party for the conduct of the first Phase I Clinical Trial (the “Lead Development Party”). If Sanofi-Aventis determines that Exelixis serve as the Lead Development Party for a Product, then Exelixis’ responsibility to Develop such Product shall cease after the Transfer Date for the first Phase I Clinical Trial for such Product, and Sanofi-Aventis shall be responsible (as of the Transfer Date) for all further Development of such Product pursuant in Section 3.1. If Sanofi-Aventis is the Lead Development Party for a Product, then Sanofi-Aventis shall be responsible for all Development of such Product pursuant to Sections 3.1, 5.2 and 5.3. [ * ] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

Lead Development Party. The JRDC shall recommend to Sanofi-Aventis the Party that it believes should serve as the lead Party for the conduct of the first Phase I Clinical Trial for each Product. The JRDC’s recommendation shall be made in the best interest of the Collaboration. After careful review of the recommendation of the JRDC, Sanofi-Aventis shall determine which Party shall serve as the lead Party for the conduct of the first Phase I Clinical Trial (the “Lead Development Party”). If Sanofi-Aventis determines that Exelixis serve as the Lead Development Party for a Product, then Exelixis’ responsibility to Develop such Product shall cease after the Transfer Date for the first Phase I Clinical Trial for such Product, and Sanofi-Aventis shall be responsible (as of the Transfer Date) for all further Development of such Product [ * ] = Certain confidential information contained in this document, marked by brackets, has been omitted and filed separately with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended. pursuant in Section 3.1. If Sanofi-Aventis is the Lead Development Party for a Product, then Sanofi-Aventis shall be responsible for all Development of such Product pursuant to Sections 3.1, 5.2 and 5.3.