Interacts with CABP1 AND CALR (PubMed:24256100). Interacts with INCA1 (By similarity). In caudal sperms localizes onto sperm head. Is also present on midpiece and principle piece of sperm tails. Acrosome and sperm tail localization is regulated by Y-chromosome. Expressed in sperm (at protein level) (Ref.4). Expressed from almost all the cell types of testis, with abundant expression in round and elongated spermatids (at protein level) (PubMed:24256100). Predominantly expressed in tissues containing motile cilia (PubMed:27914912). Expressed in the developing fetal lung epithelium (at protein level). Expression is activated by FOXJ1 and NOTO.