Catalysis of the hydrolysis of peptide bonds in a polypeptide chain by a mechanism in which the sulfhydryl group of a cysteine residue at the active center acts as a nucleophile. [ GOC:mah http://merops.sanger.ac.uk/about/glossary.htm#CATTYPE ]

Catalysis of the hydrolysis of peptide bonds in a polypeptide chain by a mechanism in which the sulfhydryl group of a cysteine residue at the active center acts as a nucleophile. [ https://www.ebi.ac.uk/merops/about/glossary.shtml#CATTYPE GOC:mah ]