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Fig. 5. btd expression in disc primordia requires wg activity and is downregulated by Ubx in the first abdominal segment. (A) btd expression in a wild-type embryo. Arrows indicate the three thoracic imaginal primordia. (B) wg- embryo lacking btd expression in the thoracic imaginal primordia. Dots of expression observed probably correspond to the precursors of the CNS. (C) In an Ubx1 mutant embryo, there is an additional imaginal primordium in the first abdominal segment, which also expresses btd (arrows).





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