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Atoh1 deletion at P1 does not affect hair cell number or stereocilia formation. Pups were injected with tamoxifen at P1 and cochleae harvested at P3. Phalloidin labeling revealed no loss of hair cells or stereocilia abnormalities. Scale bar: 500 μm (A, B); 15 μm (A′, A″, B′, and B″).
