. "Cell cycle progression is regulated by cyclin-dependent protein kinases at both the G1/S and the G2/M transitions by cyclin-dependent protein kinases. The G2/M transition is regulated through the phosphorylation of nuclear lamins and histones (reviewed in Sefton, 2001)."^^ . . . . . . "Cyclin A/B1 associated events during G2/M transition"^^ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .