definiens: means any patent or patent application or allowed c laim of a patent application existing as of the Effective Date or arising during and pursuan t to the Research Collaboration, which is developed and Controlled by [COMPANY] or its Affiliates, that pertains specifically to any Collaboration Target or to any Collaboration Compound, Backup Compounds, or any Lead Compound or Licensed Product, or any [COMPANY] DDD or [COMPANY] DFS pertaining specifically to any of the foregoing, wh erein the practice of subject matter recited in a c laim therein is necessary or useful for [COMPANY] or Sirna to carry out i ts activities under this Agreement, and any continu ations, continuations - in - part, reissues, reexaminations, or divisionals thereof, and any extensions of term or supplemental protection certificates directed there to, and all foreign and P.C.T. equivalents and coun terparts thereof