(A) Left panel: Schematic drawing of a stage 17 Drosophila embryonic head, highlighting the stereotypic innervation of the anterior feeding muscles by specific MNs, MHE (green) by MN2a, which only expresses Dfd, MHD (red) by MN3, which only expresses Scr, and LR (purple) by MN2c, which only expresses Lab. Right panel: Representative confocal images of early stage 17 Drosophila embryonic heads, highlighting the expression pattern of the anterior Hox TFs Lab, Dfd and Scr, showing that Lab is expressed in the LR muscle, Dfd in the MHE muscle and Scr in the MHD muscle. The muscles are indicated by white dashed lines. 