definiens: means the period of time beginning on the Effective Date and ending upon the [ * * * ] anniversary thereof ; provided that [ * * * ] may, in its sole discretion, elect to terminate such DM1 Guide Research Term after the [ * * * ] anniversary of the Effective Date on [ * * * ] days ’ prior written notice to [ * * * ] ; and provided further, that, if [ * * * ] does not elect to terminate the DM1 Guide Research Term before such [ * * * ] anniversary and any DM1 Guide Research activities under the DM1 Guide Research Plan are incomplete on such [ * * * ] anniversary, [ * * * ] will, at [ * * * ] election, complete such activities, and the DM1 Guide Research Term wi ll be extended for up to [ * * * ] additional months to complete such activities or such longer period as may be agreed upon by both Parties