Fig. 6. Midgut expression comparisons between several enhancers regulated by Lab. (A) Sequences of the Lab/Exd-binding sites of enhancers thought to be regulated by Lab (red) and its co-factors Exd (blue) and Hth (bold). The two central nucleotides of the Lab/Exd-binding site are highlighted in yellow. These enhancers are derived from the mouse Hoxb1 (repeat3), or the Drosophila Lab (lab550 and lab48/95) genes. The sequence of the divergent Lab/Exd/Hth-binding site of the EVIII enhancer of CG11339 is also shown for comparison. (B-I) All embryos are shown at stages 12 and 14. Confocal analysis of Lab (immunostaining; green) and ß-gal (immunostaining; red) expressions in lines carrying the lacZ transgene under the control of enhancers lab550 (B,C), lab48/95 (D,E), repeat3 (F,G) and EVIII of CG11339 (H,I).