when these cells were cultured in medium supplemented with ascorbate and pulsed for 24 hr with [ 14c ] proline , about 2 % of the [ 14c ] proline in the nondialyzable protein secreted into the culture medium by these cells was hydroxylated , and about 10 % of the incorporated [ 4c ] proline was solubilized by purified collagenase .
C1327616
secreted
C0007634
cells