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Horizontal cells are not affected by apoptosis. (A-F): Stage 21 (A), 24 (B), 27 (C), 29 (D), 31 (E) and 35 (F) retinas stained for TUNEL (green) and Prox1 (red) reveal no overlap between the two signals. Scale bars: 20 μm (B and F are valid for A-B and E-F).
