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Responses of epithelium-denuded IPT to flavorings. (A) Diacetyl applied to the IL bath elicited responses that were similar to what had been observed in intact trachea. (B) Responses to IL 2,3-pentanedione in the absence of the epithelium were not different from responses to IL 2,3-pentanedione in intact trachea; see (A). (C) Comparison of responses to IL diacetyl and 2,3-pentanedione. Diacetyl, n = 5; 2,3-pentanedione, n = 6.
