Enables serine-type endopeptidase activity. Involved in proteolysis. Acts upstream of or within camera-type eye development. Located in endoplasmic reticulum. Is expressed in nervous system and visual system. Used to study isolated microphthalmia 6. Human ortholog(s) of this gene implicated in isolated microphthalmia 6. Orthologous to human PRSS56 (serine protease 56). [provided by Alliance of Genome Resources, Apr 2022]