in collagen molecules possessing a low stability ( their number may amount to 20-30 % ) within the temperature range of 4-30 degrees c pepsin causes a split-off of n-terminal sites with the formation of short chains , i.e. , alpha 1 ( i ) , alpha 2 ( ii ) , and alpha 1 ( ii ) , whereas at higher temperatures ( 33 degrees c for collagens type i and 37 degrees c for collagens type ii ) a complete degradation of these molecules takes place .
C0009325
collagen
C0041455
collagens type i