Blood cell phenotypes associated to melanotic mass formation. Blood smears from third instar larvae carrying the msn-lacZ transgene and expressing UAS-dsRNA targeting the indicated gene under the control of srp-Gal4. Hemocyte actin cytoskeleton was visualized using phalloidin (red) and expression of the lamellocyte marker msn-lacZ was revealed by fluorescent immunolabeling against β-Gal (green). Nuclei were stained with DAPI. Arrowheads indicate atypical hemocytes that express β-Gal but do not exhibit the large flattened morphology of lamellocytes.