Figure 4. Phagocytosis in eiger Mutants.

Week-old male flies were injected with FITC-labeled dead S. aureus and allowed to phagocytose the particles and then were injected with Trypan blue to quench extracellular fluorescence. The dorsal abdomen of the fly was photographed under epifluoresence optics. Anterior is on the left. (A) Wild-type fly (w¹¹¹⁸); (B) eiger mutant fly (w¹¹¹⁸; egr¹/egr³). Bright spots indicate hemocytes that have phagocytosed the S. aureus. The pictures are representative of the 15 flies examined for the experiment.