Predicted to enable cyclin-dependent protein serine/threonine kinase regulator activity. Predicted to be involved in mitotic cell cycle phase transition and regulation of cyclin-dependent protein serine/threonine kinase activity. Predicted to act upstream of or within cell division and meiotic cell cycle. Predicted to be located in nuclear speck. Predicted to be part of cyclin-dependent protein kinase holoenzyme complex. Predicted to be active in centrosome; cytoplasm; and nucleus. Is expressed in ovary and seminiferous tubule. Orthologous to human CCNB3 (cyclin B3). [provided by Alliance of Genome Resources, Apr 2022]