Plays a fundamental role in microtubule-organizing center structure and function (By similarity). Plays a role in sperm cilia formation (PubMed:27530713). Monomer (By similarity). Interacts with PIFO (PubMed:20643351). Centrosome of interphase and mitotic cells. In the retinal photoreceptor cells, localizes at the connecting cilium, a thin bridge linking the cell body and the light-sensing outer segment (PubMed:30120214). Expressed in testis. Localizes to the caudal portion of spermatozoa in seminiferous tubule and epididymis (PubMed:10486202). Expressed in retina photoreceptor cells (at protein level) (PubMed:30120214). First expressed at 14 days postpartum (dpp). Levels increase dramatically between 14 dpp and 17 dpp. Binds two moles of calcium per mole of protein. Belongs to the centrin family.