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Influence of exogenous ATP injected into the endolymph. a Change in EP (% maximum EP, mean ± SEM) and CoPR following injection of ATP (100 μM, 20 nL) into the scala media for young (3–6 months) and older (12–15 months) mice. b Relationship between the percentage change in the endocochlear potential (EP) and cochlear partition resistance (CoPR) in young (3–6 months, triangles) and older (15–18 months, squares) mice
