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Expression of the α10 nAChR subunit before and after the onset of hearing. α10 nAChR (red, closed arrow) in IHCs at P10 (A) and P15 (B) of the middle cochlear turn. The section is counterstained with synaptophysin to demarcate the efferent fibers (syn, green, open arrow). The IHC is delineated with a dotted line. Note the disappearance of the α10 nAChR on P15. Scale bars, 5 μm.
