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Fig. 1. The effects of the NO donor SNP (5x10–3 mol l–1; cross-hatched bars; N=6) on (A) noradrenaline (unfilled component of bars), adrenaline (filled component of bars) and total catecholamine (sum of noradrenaline + adrenaline) and (B) nitric oxide (NO) secretion rates over a 10 min period in response to electrical stimulation (60 V,20 Hz) of a perfused posterior cardinal vein preparation of rainbow trout. Values are means ± 1 S.E.M. A dagger denotes a significant difference (P<0.5) between pre-stimulated and stimulated samples. An asterisk denotes a significant difference (P<0.5) between the control (N=6) and the SNP treated group.