analysis of collagen type at each successive subculture until the time of cellular senescence has shown that a change in synthesis occurs from the cartilage-specific type ii collagen ( chain composition [ alpha1 ( ii ) ] 3 ) to a mixture of type i collagen ( chain composition [ alpha1 ( i ) 2alpha2 ) and the type i trimer ( chain composition [ alpha1 ( i ) ] 3 ) .
C0009325
collagen
C0041455
type i collagen