May play a role in acrosome development and also in sperm maturation and motility. Located in the cytoplasm of spermatocytes and in the acrosomal vesicle region of round, elongating and elongated spermatids. Detected in the main piece of the flagellum in testicular spermatozoa. Detected also in the connecting piece, middle piece and cytoplasmic droplets of epididymal spermatozoa. Specifically expressed in testis (at protein level). Expressed in the spermatogenic cells during early spermatogenesis (at protein level). Expressed postnatally from week 1 onwards with a slight increase in expression levels until week 3 (at protein level). Belongs to the PRAME family.