these 14c-labelled macromolecules were extracted from previously delipidated and salt-extracted lung by 5m-guanidinium chloride in the presence of dithiothreitol and proteinase inhibitors before ( extract a1 ) and after ( extract a2 ) hydrolysis of the collagen by collagenase .
C0020291
hydrolysis
C0162745
collagenase