Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At3g19770	Functions as a guanine nucleotide exchange factor (GEF) for Rab small GTPases.	VPS9a, the common activator for two distinct types of Rab5 GTPases, is essential for the development of Arabidopsis thaliana.; 2007; DOI: 10.1105/tpc.107.053876; PMID: 18055610; https://pubmed.ncbi.nlm.nih.gov/18055610/ | GDP-bound and nucleotide-free intermediates of the guanine nucleotide exchange in the Rab5·Vps9 system.; 2010; DOI: 10.1074/jbc.m110.152132; PMID: 20833725; https://pubmed.ncbi.nlm.nih.gov/20833725/
Rice	Os03g0262900	Functions as a guanine nucleotide exchange factor (GEF) for Rab small GTPases.	OsVPS9A functions cooperatively with OsRAB5A to regulate post-Golgi dense vesicle-mediated storage protein trafficking to the protein storage vacuole in rice endosperm cells.; 2013; DOI: 10.1093/mp/sst081; PMID: 23723154; https://pubmed.ncbi.nlm.nih.gov/23723154/