Fig. 8. Negative regulation of eyg by Dpp signalling. (A-C) Derepression of eyg in Mad-mutant clones (black). Note that in the larger clone (arrow), eyg (red) is activated only in the cells closer to the eyg domain. (D-F) Two Mad clones (arrows), a small one close to the eyg domain, showing ectopic eyg activation, and a larger one in the posterior compartment, in which eyg is not activated. Note the increase of eyg expression in the mad clone close to the border (arrowhead). (G-I) Several clones mutant for a constitutive form of the Tkv receptor, showing repression of eyg.