addition of l-3,4-dehydroproline to the culture medium inhibited markedly the incorporation of [ 14c ] glycine and l- [ 3h ] lysine into the collagen of 3t3 cells , but there was only slight inhibition of the incorporation of the radiolabeled amino acids into total cellular proteins , indicating that the action of l-3,4-dehydroproline is specific for collagen .
C0017890
glycine
C0002520
amino acids