Involved in the control of the cell cycle at the G2/M (mitosis) transition. May associate to CDKB2-1 and activate CDKB2-1 kinase activity to promote cell division. Interacts with CDKB2-1, MRS2-F and MRS2-G. Expressed during interphase, prophase, metaphase and disappears at anaphase and telophase. Expressed in the root apices. Expressed in the G2/M phases and disappears at the anaphase of mitosis. By gibberellic acid (GA3). Belongs to the cyclin family. Cyclin AB subfamily.