Enables aminopeptidase activity; kininogen binding activity; and protein self-association. Involved in several processes, including cellular response to thyroid hormone stimulus; response to odorant; and spermatogenesis. Located in several cellular components, including cytoskeleton; lysosome; and secretory granule. Biomarker of polycystic kidney disease. Orthologous to human CTSH (cathepsin H). [provided by Alliance of Genome Resources, Apr 2022]