DEN4B_HUMAN, DENN domain-containing protein 4B, DENN/MADD domain containing 4B, Dennd4b, hCG_18235, KIAA0476.
Guanine nucleotide exchange factor (GEF) which may activate RAB10. Promotes the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form