Fig. 9. A summary diagram showing the expression domains in wild-type leg, wild-type antenna, wild-type labial discs and mutant labial discs of the appendage patterning genes analyzed in this study. Wild-type leg and antenna with their respective imaginal disc expression patterns are at the top for reference. The wild-type appendage of the labial disc, the proboscis and various mutant phenotypes are diagramed below and to the right. The genotype of the individual mutants is given above each appendage. The corresponding patterns of protein accumulation in the normal and mutant discs are shown to the right of the appendage phenotypes. Dark blue indicates relatively high levels of Hth/Exd protein accumulation and pale blue indicates low levels. The proboscis (asterisk) is displayed laterally to represent the same plane of view as the labial disc in this figure, and half is lightened to represent a single disc derivative.
