Predicted to enable cyclin-dependent protein serine/threonine kinase regulator activity. Involved in anterior/posterior axis specification, embryo and oocyte maturation. Predicted to be located in cytoplasm and nucleus. Predicted to be part of cyclin-dependent protein kinase holoenzyme complex. Expressed in germ line. Human ortholog(s) of this gene implicated in several diseases, including in situ carcinoma; renal cell carcinoma; and reproductive organ cancer (multiple). Is an ortholog of human CCNB1 (cyclin B1).