definiens: means a distinct and uniquely identifiable protein ( including glycoproteins and lipoproteins ), peptide, polysaccharide, or protein - polysaccharide conjugate, capable of eliciting a specific immune response and reacting with the products of that response and in respect of which a Party has provided to the other complete details of ( a ) in the case of a protein, the amino acid sequence or ( b ) in the case of other molecules, the chemical structure of such molecule, in each case sufficient to identify such molecule . For the purpose of this Agreement in the case of : ( i ) a protein Antigen encoded by a given gene, any antigenic determinants or epitope containing portions of such protein, and all fragments, derivatives and variants of any such protein, shall all be deemed to be one Antigen ; ( ii ) a polysaccharide Antigen from a given serogroup of Neisseria meningitidis or another . bacterial pathogen, any antigenic determinants or epitope containing portions of such polysaccharide, and all fragments, derivatives and variants of any such polysaccharide, shall all be deemed to be one Antigen ; and ( iii ) a protein - polysaccharide conjugate where each of the protein and polysaccharide components would individually meet the definition of Antigen as defined above and each . component separately contributes to protection against Neisseria meningitidis serogroup B infections, such protein and polysaccharide cornponents will each be deemed to be one Antigen ( each of which will be deemed to be the same Antigen as the relevant protein or polysaccharide and any antigenic determinants, epitope containing portions, fragments, derivatives and variants of such protein or polysaccharide, as set out above ) and such protein - polysaccharide conjugate will in such circumstances be considered two ( 2 ) Antigens