The function of RHOJ (ras homolog family member J, Ensembl gene identifier ENSG00000126785) is as follows. Plasma membrane-associated small GTPase specifically involved in angiogenesis (PubMed:21628409, PubMed:24434213, PubMed:30158707). Required for endothelial cell migration during vascular development via its interaction with GLUL (PubMed:30158707). Elicits the formation of F-actin-rich structures, thereby regulating endothelial cell migration (PubMed:30158707). {ECO:0000269|PubMed:21628409, ECO:0000269|PubMed:24434213, ECO:0000269|PubMed:30158707}.