type i collagen cnbr peptides from chick-embryo skin [ barnes , constable morton & kodicek ( 1971 ) biochem . j . 125 , 925 -- 928 ] and guinea-pig scar tissue [ shuttleworth , forrest & jackson ( 1975 ) biochim . biophys . acta 379 , 207 -- 216 ] also have an increased degree of hydroxylation of lysine with an otherwise normal amino acid composition , and it was believed that this could be an embryonic form of collagen .
C0041455
type i
C0009325
collagen