"A homozygous 2 bp deletion n.c.G623DEL-TC (p.V208VfsX20) in Arp2/3 complex component ARPC1B that causes a frame shift resulting in premature termination was found in 2 brothers with hematopoietic and immunologic symptoms reminiscent of Wiskott-Aldrich syndrome. Wild-type ARPC1B but not mutant was able to rescue a deficiency in a zebrafish model. ARPC1B expression is restricted to hematopoietic cells."xsd:string