To this end, we injected SW480, SW620, and MIX tumor cells into Tg(mpx:eGFP)23 and Tg(mpeg1:mcherry-F)24 zebrafish hosts, which have neutrophils (Fig. 3a, b) and macrophages (Fig. 3e, f) labeled, respectively. This evidence concerns the gene MPEG1 and neoplasm.