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Responses of wild-type and mutant lab enhancers to Dpp. Side views of 12- to 13-hr-old embryos, bearing lab HZ550 (A,B), 550M (C,D), 550C (E,F), or 550CM (G,H), stained with lacZ antibody; (left) wild type; (right) 48Y.GAL4/UAS.Dpp. Open triangles in F and H indicate complete loss of response to ectopic Dpp in the anterior midgut, whereas arrowheads point to residual response in ps8–ps10 (which may reflect a response to expanded Wg expression; see text).
