definiens: shall mean those Antigens discovered by [COMPANY] in the BC Field, PC Field or Tb Field prior to the Effective Dateftli ~ t will be identified on Exhibit 1 ( uu ) attached hereto, which Exhibit shall be finalized on or before December 31, 1998 by the R&D Steering Committee, based on good faith scientific rationale and taking into account those Antigens listed on Exhibits 5 ( d)(i)-2(A ) and 5(d)(i)-2(B ) hereto, and which will include only those Existing [COMPANY] Antigens : ( i ) in the case of the BC Field and the PC Field, that have been demonstrated prior to July 1, 1998 to meet a reasonable proportion of the criteria of ( as such term is defined in Exhibit C to each of the BC Agreement and the PC Agreement ), and ( ii ) in the case of the Tb Field, to have been identified prior that July 1, 1998 as Vaccine Product or Diagnostic Product candidates ; provided, however, in the event that at least four ( 4 ) of the six ( 6 ) members of the applicable subcommittee of the R&D Steering Committee are unable to reach such agreement with respect to ( a ) particular Antigen(s ), then such Antigen(s ) shall be deemed to be ( an ) Existing [COMPANY] Antigen(s ) if such Antigen(s ) is ( are ) also listed on Exhibits 5(d)(i)-(2)(A ) and 5<[)T-2(B ), in the latter case as finalized and validated in accordance with Subsection 4(b ) ( i )