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Experimental traces from (a) intact, (b) detrusor, (c) mucosal and (d) dissected mucosal strips of porcine bladder. Strips weighed 100, 60, 11 and 8 mg, respectively. Discrete responses, measured in grams tension (g), were obtained to increasing concentrations of neurokinin A (NKA), indicated by arrows. W, indicates washing of preparation.
