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Fig. 3. Effects of K+ channel inhibitors 4-aminopyridine (4-AP; 100
µmol l-1; N=4), apamin (APA,100 nmol l-1;
N=4), charybdotoxin (CTX; 50 nmol l-1; N=4) and
APA and CTX in combination (N=4) on a 10 µmol l-1
carbachol contraction (left) or on a 1 mmol l-1 H2S (as
Na2S)-induced relaxation of a 10 µmol l-1 carbachol
prestimulated bladder (right); all controls, N=8. Values are means
± s.e.m. The inhibitors had no significant effect on either the CARB
contraction or the H2S relaxation.