In pupal wing, expression in anterior compartment not uniform: slightly fainter in cells midway between L3 and L4 down to the AP lineage boundary.
Enhancer trap staining occurs in wide,segmentally repeated stripes in embryos and in imaginal discs. In bothembryos and imaginal discs, expression was found to be in the anteriorcompartments and precisely complements en expression. In engrailedmutants, EcollacZ expression is derepressed in the posterior compartments inembryos and imaginal discs, suggesting that ci expression is normallyrepressed by en in these cells.