Using a phosphomotif antibody (Moritz et al., 2010), we found that MEF2 T20 phosphorylation was detectable in extracts from whole-adult Drosophila and was reduced in flies that had received weak or strong immune challenges (PBS injection or mixed infection with M. luteus and E. coli, respectively) (Figure 6C). The gene discussed is MEF2A; the disease is infection.