How do growth factors influence the progression of the cell cycle?

Growth factors are signaling molecules that can stimulate cells to grow and divide. They play a crucial role in regulating the progression of the cell cycle by activating specific proteins called cyclin-dependent kinases (CDKs). These CDKs help control the timing and progression of different phases of the cell cycle, such as G1, S, G2, and M phases. By activating CDKs, growth factors can promote cell proliferation and regulate cell cycle progression.