Cdc42 is a small signaling protein that belongs to the Rho family of GTPases. It plays a crucial role in regulating various cellular processes, including cell shape, movement, and division. By cycling between an active and inactive state, Cdc42 helps control the organization of the cytoskeleton, which is essential for maintaining the structure of cells. In addition to its role in cell morphology, Cdc42 is involved in signaling pathways that affect cell growth and differentiation. Dysregulation of Cdc42 has been linked to various diseases, including cancer, making it an important target for research in cell biology and therapeutic development.