Bam functions cell-autonomously in hematopoietic progenitors. (A) TepIVGal4-driven UAS-mCD8::GFP marks blood cell precursors whereas P1 marks plasmatocytes within a wild-type Drosophila lymph gland. (B,C) Loss of hematopoietic progenitors and increase in plasmatocytes due to UAS-bam RNAi expression. (D) Control lymph gland stained for prohemocytes and Antp-expressing PSC cells. (E,F) Hematopoietic progenitors are decreased owing to UAS-bam RNAi expression. CZ, cortical zone; MZ, medullary zone; PSC, posterior signaling center.