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Figure 3


Fig. 3. Ectopic DRA ommatidia in the Apc1 mutant retina. (A) Whole-mount adult retina of Rh3>lacZ flies stained with X-gal. Rh3 is expressed in 30% of all R7 cells, as well as in all R7 and R8 cells of the DRA ommatidia. (B) In Apc1Q8 flies heterozygous for grim, reaper and hid (Df(3L)H99), Rh3 is present in an increased number of PRs throughout the dorsal half of the retina. (C) Adult eye section from the dorsal-most regions of a wild-type retina. Ommatidia with a DRA fate are found above the solid white line, and are characterized by inner photoreceptors with enlarged rhabdomeres (green arrowheads). (D) A Df(3L)H99 mutant clone located away from the retinal periphery in the Apc1Q8 mutant. Inner PRs with enlarged rhabdomeres are observed in many ommatidia that are not restricted to the dorsal rim (green arrowheads).





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