definiens: means any Patent claiming or covering any invention which was first conceived by either Party under an Fcab Discovery Program and/or a mAb2 Development Plan and/or Technical Development ( whenever it was undertaken ) which claims or covers ( i ) improvements, modifications and enhancements to the inventions claimed ( either in issued claims or pending claims ) in the Licensor Background Patents tha t exist as of the Effective Date, and such improvements, modifications and enhancements are covered by the claims ( either in issued claims or pending claims ) of the Licensor Background Patents that exist as of the Effective Date ( ii ) [ * * * ] ( iii ) [ * * * ] and ( iv ) [ * * * ] provided always that Platform Patents do not include any Patent which specifically claims or covers ( a ) the amino acid sequence of the antigen binding site and Confidential * * * Certain information in this agreement has been omitted and fi led separately with the Securities and Exchange Commission . [ * * * ] indicates that text has been omitted and is the subject of a confidential treatment request