Cyclin B1 regulates mitosis in conjunction with Cdc2 kinase to form the Cdc2-cyclin B1 complex also known as maturation promoting factor (MPF) (1-2). The activation of the complex begins when the regulatory subunit, cyclin B1, associates with the catalytic subunit of Cdc2. Cyclin B1 levels rise during S phase and G2, and peak at mitosis. The timing of mitosis can also be influenced by changes in cyclin B1Cdc2 localization. Cyclin B1 is mostly located in the cytoplasm during S and G2 phases and then rapidly accumulates in the nucleus at the onset of prophase (3).
Hedgehog signaling pathway
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