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The simultaneous loss of Toy and ISWI transforms the head epidermis into an antenna. (A,D) The number of antennae within the eye-antennal disc is unchanged when ISWI alone is removed. (B,E) A fully formed second antenna is found in discs in which ISWI and Toy are simultaneously knocked down. (C,F) This effect appears to be specific to Toy, as the simultaneous loss of Ey and ISWI does not appear to affect antennal number. Scale bar: 50 µm.
