RAC1 is a small GTPase protein that plays a crucial role in various cellular processes, including cell migration, proliferation, and survival. It is part of the Rho family of GTPases, which are known for their involvement in regulating the cytoskeleton and signaling pathways. RAC1 is activated by exchanging GDP for GTP, leading to downstream effects that influence cell behavior. In addition to its role in normal cellular functions, RAC1 has been implicated in several diseases, including cancer and autoimmune disorders. Abnormal activation of RAC1 can contribute to tumor progression and metastasis, making it a potential target for therapeutic interventions in conditions like breast cancer and inflammatory diseases.