the 52-residue hagfish insulin has many structural features in common with other vertebrate insulins including the locations of the 6 half-cystine residues , the nh2-terminal 7 residues and the cooh-terminal 6 residues of the a chain , and several shorter sequences in the b chain that are known to comprise the dimer interface in porcine insulin crystals .
C0021641
insulin
C0724601
porcine insulin