Acts upstream of or within several processes, including Sertoli cell development; fertilization; and spermatid development. Located in acrosomal vesicle; cytosol; and vesicle membrane. Is expressed in brain; inner ear; limb; and submandibular gland primordium. Orthologous to human FNDC3A (fibronectin type III domain containing 3A). [provided by Alliance of Genome Resources, Apr 2022]