May be involved in meiosis. Isoform 1 may be involved in meiosis during spermatogenesis while isoform 2 is probably related to a later stage of meiosis, in the development stage of secondary spermatocytes and spermatids. Isoform 1 is abundantly expressed in testis and weakly in ovary, it is not found in other tissues. Isoform 2 is expressed in testis and poorly in brain, heart, lung and other examined tissues. Not detected in embryo. Isoform 1 is detected in testis at day 8 after birth while isoform 2 at day 17. Belongs to the SYCE family. Extended N-terminus.