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Relaxations of PCMAs, preconstricted with U46619, to L-SNC in the absence (control) or presence of one or more of the following inhibitors: 100 nM iberiotoxin (iber), 100 nM apamin (apa), 5 mM 4-aminopyridine (4-AP), 100 μM L-NAME, 1 μM glibenclamide, 0.5 mM ouabain or 30 μM BaCl2. Data (mean±s.e.mean; n=4–9) are expressed as a percentage of the contraction induced by U46619.
