Catalysis of the hydrolysis of a single N-terminal amino acid residue from a polypeptide chain by a mechanism in which the sulfhydryl group of a cysteine residue at the active center acts as a nucleophile.
Source:
https://www.ebi.ac.uk/merops/about/glossary.shtml#CATTYPE,
https://www.ebi.ac.uk/merops/about/glossary.shtml#AMINOPEPTIDASE,
GOC:mah