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Morphology of the rtp1 mutant retina. Cross-section of wild type (A), rtp1 mutant (B) photoreceptors at <1 d after eclosion and rtp1 mutant photoreceptors at 7 d (C) are shown. The sections are at comparable depths, indicated by the presence of R1–R6 photoreceptor nuclei (n) in all images. The rtp+ genotype was rtp1/+; the rtp mutant genotype was rtp1/Df(3R)5142. Scale bars, 5 μm.
