This family represents the N-terminus of the sperm centrosome protein speriolin [1-2].

1: Speriolin is a novel spermatogenic cell-specific centrosomal protein associated with the seventh WD motif of Cdc20. Goto M, Eddy EM; J Biol Chem. 2004;279:42128-42138. PMID:15280373

2: Speriolin is a novel human and mouse sperm centrosome protein. Goto M, O'Brien DA, Eddy EM; Hum Reprod. 2010;25:1884-1894. PMID:20542897