the striking bell-shaped component that is a characteristic feature of the reactions of s-/imh+ ( thiolate/imidazolium ) ion-pair components of many cysteine-proteinase catalytic sites with the 2,2'-dipyridyl disulphide univalent cation is not present in the ph-k profile for the chymopapain a reaction .
C0022023
ion
C0007447
cation