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Fig. 6. Levels of apoptosis in retinas of tadpoles carrying Xrx1A-{Delta}FGFR4a transgene. (A,C) Cross-section of TUNEL-stained eyes of wild-type embryos at stage 29 (A) and stage 35 (C). (B,D) Cross-section of TUNEL-stained eyes of embryos carrying the Xrx1A-{Delta}FGFR4a transgene at stage 29 (B) and stage 35 (D). (E) Histogram showing the average number of labeled apoptotic cells on each retina of the wild-type (car-GFP transgenic) and transgenic (car-GFP/Xrx1A-{Delta}FGFR4a transgenic) embryos at each stage. Wild type (stage 29, n=16 retinas; stage 35, n=20 retinas); transgenic (stage 29, n=28 retinas; stage 35, n=24 retinas).