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Fig. 6. FGF signaling in dorsal midgut endoderm. (A) Midgut dorsal endoderm cultured alone (A, lane 1) or exposed to the designated concentration of FGF (A, lanes 2-4; B-E) for 2 days. Explants were analyzed for the activation of the designated marker by RT-PCR analysis (A) or immunofluorescence (B-E).