May be involved in fertilization (By similarity). Has no detectable bacteriolytic and lysozyme activities in vitro (PubMed:22110709). Monomer. Found in the principal piece of sperm tail. Expressed in the brain, lung, ovary, uterus and testis (PubMed:22110709). In testis expressed in the germinal epithelium and on the maturing spermatozoa (at protein level) (PubMed:22110709). Present during stages of postnatal development from 10 to 60 days old (PubMed:22110709). Belongs to the glycosyl hydrolase 22 family. Although it belongs to the glycosyl hydrolase 22 family, Gly-72 is present instead of the conserved Asp which is an active site residue. It is therefore expected that this protein lacks hydrolase activity.