Predicted to enable identical protein binding activity and serine-type endopeptidase activity. Involved in glial cell differentiation and response to cAMP. Located in extracellular region. Human ortholog(s) of this gene implicated in Ehlers-Danlos syndrome periodontal type 2. Orthologous to human C1S (complement C1s). [provided by Alliance of Genome Resources, Apr 2022]