Predicted to enable several functions, including collagen binding activity; fibronectin binding activity; and proteoglycan binding activity. Involved in bone resorption and intramembranous ossification. Located in extracellular space and lysosome. Biomarker of intracranial aneurysm and otitis media. Human ortholog(s) of this gene implicated in pycnodysostosis. Orthologous to human CTSK (cathepsin K). [provided by Alliance of Genome Resources, Apr 2022]