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Atoh7 declines faster in terminal S-phase in SE deletion mutants. (A–E) Distribution of Atoh7+ and EdU+ cells in E14.5 retinas. Double-positive cells, which have initiated Atoh7 expression during terminal S-phase (90-min EdU pulse), are present in all genotypes (Inset). (F) A greater fraction of Atoh7+ cells are EdU+ in SE/SE and SE/KO retinas compared to +/+. *P < 0.05. (Scale bar: 50 µm.)
