Guanine nucleotide exchange factor (GEF) which may activate the small GTPases Rab. May promote the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form (By similarity). {ECO:0000250}.
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Stadnicka, Dębowska, Dębski, Bajek: "Secreting oviduct epithelial cells of Coturnix coturnix japonica (QOEC) and changes to their proteome after nonviral transfection." in: Journal of cellular biochemistry, Vol. 120, Issue 8, pp. 12724-12739, (2019) (PubMed).