( iii ) tadpole tail collagenase , which cuts native collagen into triple-stranded 3/4 pieces containing the nh2 termini and 1/4 pieces containing the cooh ends , cuts procollagen into 3/4 pieces with nh2-peptides attached and 1/4 pieces attached to the disulfide-linked cooh-peptides .
C0009325
collagen
C0033235
procollagen