by criteria indicated above , the collagen precipitating at 2.2 m nacl was identified as type i collagen ( chain composition , [ alpha ( i ) ] 2alpha2 ) , whereas the collagen subsequently precipitated at 0.01 m na2hpo4 was found to be comprised entirely of alpha1 ( i ) chains , indicating a chain composition , [ alpha ] ( i ) ] 3 .
C0041455
type i collagen
C0009325
collagen