Serves as an important signal transducer for a novel upstream stimuli in controlling cell proliferation. Activates the MAP kinase pathway. GTP + H2O = GDP + H(+) + phosphate Interacts with RGL3. Interacts (active GTP-bound form preferentially) with RGS14 (By similarity). Forms a multiprotein complex with SHOC2, Raf (RAF1) and protein phosphatase 1 (PPP1CA, PPP1CB and PPP1CC). Expression highly restricted to the brain and heart. By IL9/interleukin-9, but not by IL2/interleukin-2 or IL4/interleukin-4. The disease is caused by variants affecting the gene represented in this entry. Belongs to the small GTPase superfamily. Ras family.