each polypeptide consists of three regions : ( a ) an nh2-terminal segment of 18-19 amino acids which is rich in cysteine and appears to be involved in the formation of interchain disulfide bonds which stabilize dimeric and trimeric forms of the protein , ( b ) a collagen-like domain consisting of 18-20 repeats of the sequence gly-x-y and containing 4-hydroxyproline residues in several of the y positions , and ( c ) a cooh-terminal carbohydrate-binding domain of 148-150 amino acids .
C0017890
gly
C0002520
amino acids