Calcium-binding protein (PubMed:26990073). May be involved in the control of sperm flagellar movement (PubMed:26990073). Colocalized with pericentrin at centrosome of spermatocytes and round spermatids (PubMed:26990073). Testis-specific (PubMed:26990073). Expressed in spermatocytes and round spermatids (at protein level) (PubMed:26990073).