Predicted to enable Arp2/3 complex binding activity. Acts upstream of or within actin filament debranching and negative regulation of Arp2/3 complex-mediated actin nucleation. Is expressed in several structures, including cardiovascular system; hemolymphoid system; liver; lung; and yolk sac. Orthologous to human GMFG (glia maturation factor gamma). [provided by Alliance of Genome Resources, Apr 2022]