Predicted to enable serine-type endopeptidase activity. Predicted to be involved in several processes, including cochlea morphogenesis; positive regulation of nitrogen compound metabolic process; and regulation of epithelial cell proliferation. Predicted to act upstream of or within several processes, including cholesterol homeostasis; negative regulation of alkaline phosphatase activity; and sensory perception of sound. Predicted to be located in several cellular components, including cell surface; endoplasmic reticulum membrane; and neuronal cell body. Predicted to be integral component of plasma membrane. Predicted to colocalize with nuclear membrane. Orthologous to human HPN (hepsin). [provided by Alliance of Genome Resources, Apr 2022]