該基因編碼一種核蛋白，這是一種屬于SER/THR蛋白激酶家族的酪氨酸激酶。這種蛋白催化CDC2/cyclin B激酶的抑制性酪氨酸磷酸化，并似乎通過保護細胞核免受細胞質激活的CDC2激酶的影響來協調DNA復制和有絲分裂之間的轉換。
This gene encodes a nuclear protein, which is a tyrosine kinase belonging to the Ser/Thr family of protein kinases. This protein catalyzes the inhibitory tyrosine phosphorylation of CDC2/cyclin B kinase, and appears to coordinate the transition between DNA replication and mitosis by protecting the nucleus from cytoplasmically activated CDC2 kinase.