Fig. 5. Invasion of A compartments by caspase-inhibited cells in hh-Gal4>UAS-p35 UAS-GFP wing discs. (A-B) Disc showing a group of posterior cells (arrow), labelled green by GFP, invading the A compartment. They express the engrailed (en) gene (red), indicating that their behaviour is not due to change of cell affinities. (C-D,E-F) Two discs showing intrusions into the A compartments (arrows). In each case the caspase-inhibited cells express wg, therefore carrying the secreted Wg product into the A compartment.