VAV2 (Vav Guanine Nucleotide Exchange Factor 2): VAV2 is a guanine nucleotide exchange factor (GEF) that transmits signals from tyrosine kinase receptors to Rho GTPases. It plays a key role in regulating cell shape, movement, and proliferation through its influence on cytoskeletal dynamics and cell signaling pathways. Dysregulation of VAV2 has been associated with cancer progression, making it an important focus in studies of tumor development and metastasis.