Immunogen sequence: AEISSISFHV TDPAPCSTSG VTAGLTKLTT RKDNYNAERE FLQGATITEA CDGSDDIFGL STDSLSRLRS PSVLEVREKG YERLKEELAK AQ. Guanine nucleotide exchange factor (GEF) which may activate RAB8A and RAB8B. Promotes the exchange of GDP to GTP, converting inacti