definiens: ( as defined in the agreement between [COMPANY] and a certain partner ) in the U.S. [ within the fields of Alzheimer 's disease and/or metabolic syndrome, provided that the foregoing requirements under this subparagraph ( i ) shall lapse prior to the end of such if, and as of the date that, there no longer exists a Valid Claim -within the [COMPANY] Core Technology Patents covering the [COMPANY] ' Drosophila technology, but solely with respect to such information as is then publicly­disclosed and not [COMPANY] Confidential Information ] ; ( ii ) no work may be performed on certain genes or proteins that, as of the Effective Date, are the focus of research being pursued under a collaboration between [COMPANY] and a certain partner for the duration of such with such certain partner ; and ( iii ) [COMPANY] may not commence research utilizing such technology in the fields of [ Alzheimer 's disease and/or metabolic syndrome ] before [ September 1, 1999 ]