Immunogen sequence: VSAVPEESEM DPHVRDCIRS YTEDWAIVIR KYHKLGTGFN PNTLDKQKER QKGLPKQVFE SDEAPDGNSY QDDQDDLKRR SMSIDDTPRG SWACSIFDLK N. The protein encoded by this gene is a guanine nucleotide exchange factor (GEF) that plays a role in axon formation and ne