after the administration of l- [ g- ( 3 ) h ] proline to guinea pigs deprived of ascorbic acid for increasing periods of time , the specific radioactivities of proline and hydroxyproline in skin collagen and aortic elastin were determined at various time-intervals after administration of the labelled compound with a view to studying the formation and degradation of collagen and elastin both deficient in hydroxyproline .
C0033382
proline
C0020388
hydroxyproline