definiens: means the treatment or prevention of Huntington 's disease, Parkinson 's disease, Alzheimer 's disease, and the Other Neurodegenerative Diseases using an HDAC Inhibitor or any Compound developed pursuant to the Collaboration ; provided . however, that the term Field shall cease to include ALS or Dementia if, as to a particular Subject Indication : ( 1 ) The EVP representatives on a JSC fail to authorize the inclusion of research activities for a Subject Indication in one of the Research and Development Programs hereunder within six ( 6 ) months after the date of [COMPANY] 's written request therefor, unless the Parties are then already pursuing the research or development of such SubJect Indication pursuant to any such Research and Development Programs, or EVP is already exercising Commercially Reasonable and Diligent Efforts as a Pursuing Party to conduct work on such Subject Indication, provided that each of the Parties ( 1 ) determine in good faith, based on then available scientific data, and not on their respective Share of Profits and Losses, in which Research and Development Program the Subject Indication shall be included and ( 2 ) agree to amend the applicable Research and Development Program to include such Subject Indication, and further agree to equally fund the Research and Development Costs of all related activities for at least twelve months following its inclusion therein ; and ( 2 ) In the case where EVP is a Pursuing Party as to all of the Research and Development Programs hereunder, EVP fails to initiate and thereafter use Commercially Reasonable and Diligent Efforts to conduct work in ALS or Dementia . as the case may be, within one year after the date of [COMPANY] 's written request therefor