The function of WASH4P (WASP family homolog 4, pseudogene, ENSG00000234769) is as follows. May act as a nucleation-promoting factor at the surface of endosomes, where it recruits and activates the Arp2/3 complex to induce actin polymerization, playing a key role in the fission of tubules that serve as transport intermediates during endosome sorting. .