MPEG1 and infection: To test for a global increase in myeloid cell production following infection, Tg(mpeg1::Gal4-FF)gl25/Tg(UAS-E1b::nfsB.mCherry)c264 (herein mpeg1::G/U::mCherry) larvae were infected with Shigella in the HBV, and mCherry-expressing (mCherry+) macrophages were quantified.