WASF3 and neoplasm: To assess the effects of loss of WAVE3 phosphorylation on tumor growth in vivo, mammary fat pads of NSG mice were inoculated with parental MDA-MB-231 cells (GFP), W3-KO, or W3-KO re-expressing either W3-WT or W3-Y4, and tumor growth was assessed over 8 weeks.