Ras GTPase is a family of proteins that act as molecular switches in cells. They are involved in a wide range of cellular processes, including cell growth, differentiation, and survival. Ras GTPases are activated when they bind to guanosine triphosphate (GTP) and are inactivated when they bind to guanosine diphosphate (GDP). Mutations in Ras GTPases can lead to cancer and other diseases.