Calcium-binding tyrosine phosphorylation-regulated protein, Calcium-binding protein 86, Cancer/testis antigen 88, CT88, Fibrousheathin II, Fibrousheathin-2, FSP-2, Testis-specific calcium-binding protein CBP86, CABYR, CBP86, FSP2
May function as a regulator of both motility- and head- associated functions such as capacitation and the acrosome reaction. Isoform 1 binds calcium in vitro. Isoform 2 and isoform 6 probably bind calcium. Isoform 3 and isoform 5 do not bind calcium in vitro. Isoform 4 probably does not bind calcium.