FUNCTION: Acts as guanine nucleotide exchange factor (GEF) for CDC42. Promotes formation of GPHN clusters (By similarity). {ECO:0000250|UniProtKB:Q9QX73, ECO:0000269|PubMed:10559246}....
                        FUNCTION: Acts as guanine nucleotide exchange factor (GEF) for CDC42. Promotes formation of GPHN clusters (By similarity). {ECO:0000250|UniProtKB:Q9QX73, ECO:0000269|PubMed:10559246}.
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                        GO - Biological processes (BP): 
                        regulation of small GTPase mediated signal transduction [GO:0051056]...
                        regulation of small GTPase mediated signal transduction [GO:0051056]
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                        GO - Molecular function (MF): 
                        guanyl-nucleotide exchange factor activity [GO:0005085]...
                        guanyl-nucleotide exchange factor activity [GO:0005085]
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                        GO - Cellular component (CC): 
                        cytosol [GO:0005829]; postsynaptic density [GO:0014069]...
                        cytosol [GO:0005829]; postsynaptic density [GO:0014069]
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