Predicted to enable serine-type endopeptidase activity. Predicted to be involved in zymogen activation. Predicted to act upstream of or within complement activation, classical pathway and innate immune response. Located in extracellular space. Is expressed in cartilage; stomach; and testis. Orthologous to human C1RL (complement C1r subcomponent like). [provided by Alliance of Genome Resources, Apr 2022]