Immunogen sequence: GTITNEKRIS SVKFLSESVL AVAGDEEVIR FFDCDSLVCL CEFKAHENRV KDMISFEIPE HHVIVSASSD GFIKMWK. Negatively regulates the PAK1 kinase. PAK1 is a member of the PAK kinase family, which has been shown to play a positive role in the regulation of s