Once a cell completes mitosis, molecular division triggers must be turned off. What happens to MPF during mitosis? A. Cyclin is degraded; the concentration of cyclin-dependent kinase remains unchanged, but without cyclin, MPF is not formed. B. It is exported from the cell. C. Cyclin-dependent kinase is degraded; cyclin concentration remains constant, but without cyclin-dependent kinase, MPF is not formed.