Proteolytic enzyme possibly involved in normal cellular protein degradation and turnover. The recombinant human enzyme hydrolyzes synthetic endopeptidase substrates including Z-Phe-Arg-NHMec and Z-Arg-Arg-NHMec. Expressed in all tissues examined. High levels seen in the ovary, kidney and placenta while low levels seen in thymus and skeletal muscle. Belongs to the peptidase C1 family.