definiens: shall mean the date on which [COMPANY] Idec begins exercising such right to take over all of Sangamo ’s activitiesunder the BT Development Plan . If the BT Trigger Date is Trigger 2, then [COMPANY] Idec shall begin taking over all ofSangamo ’s unfinished activities, if any, under the BT Development Plan on the date of Phase I Completion and willhave the right, but not the obligation, to take over such activities on [ * * * ], if such date is earlier than Phase ICompletion, and the shall be such date . Notwithstanding the foregoing, if the BT Trigger Date isTrigger 2, then [COMPANY] Idec shall have the right, but not the obligation, commencing on Trigger 2 to make all decisionswith respect to the BT Program, including whether to expand the First in Human Trial and which Party would conductany such expanded study ; provided that Sangamo shall have no obligation to conduct any such expanded studyunless [COMPANY] Idec approves a budget for such expansion pursuant to Section 2.7(a ) and the Parties extend theResearch Term accordingly