leydig cells of both populations also exhibited an inactive ( latent ) renin which was activated by the sulfhydryl reagents dithiothreitol , beta-mercaptoethanol , glutathione , and cysteine but not by limited proteolysis by trypsin , which is a characteristic activating agent for prorenin or inactive renin of the zymogen type .
C0035094
renin
C0597304
proteolysis