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Detection of Islet1 (Isl1) transcripts in the developing inner ear. A: The distinct stages of the developing mouse inner ear are illustrated, including the initial recognition of the placode, neurogenesis, and cochlea specification and growth. B: Isl1 was detected at higher levels at embryonic day (E) 13.5 than at postnatal day (P)1, compared with comparable expression of a house-keeping gene L19 at both stages.
