Each subunit thus contains 11 cysteine residues : the eight canonical residues that form the core disulfide bonds and the one that forms the dimeric linkage .
The eight canonical residues that form the core disulfide bonds are the two in the first loop forming the non-conventional disulfide .
Each subunit thus contains 11 cysteine residues : the eight canonical residues that form the core disulfide bonds , the two in the first loop forming the non-conventional disulfide , and the one that forms the dimeric linkage .