Rac2 is a member of the Rho family of GTPases, which are proteins involved in various cellular processes, including cell signaling and cytoskeletal dynamics. It plays a crucial role in regulating the actin cytoskeleton, influencing cell shape and movement. Rac2 is primarily expressed in hematopoietic cells, which are involved in the formation of blood cells. Mutations or dysregulation of Rac2 can lead to various health issues, including immune deficiencies and certain types of cancer. Research on Rac2 is important for understanding its role in immune response and potential therapeutic targets for autoimmune diseases and cancer treatment.