radioactive proline-labeled procollagen , accumulated during a 3-hr incubation of normal and transformed balb 3t3 cultures , was treated with pepsin and the resulting collagen components were analyzed by carboxymethyl-cellulose chromatography and sodium dodecyl sulfate/polyacrylamide gel electrophoresis in the presence or absence of reducing agent .
C0033235
procollagen
C0009325
collagen