Could be involved at the G2/M (mitosis) transition (Probable). Interacts with the CDK1 and CDK2 protein kinases (Probable). G2/M cyclins accumulate steadily during G2 and are abruptly destroyed at mitosis (Probable). Plays a role during oocyte meiosis II (PubMed:20599902). RNAi-mediated knockdown causes a longer meiosis II in 1-cell embryos without affecting meiotic exit timing. In a pam-1 (or282) mutant background, restores normal timing for meiotic exit. Belongs to the cyclin family. Cyclin AB subfamily.