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Fig. 3. The effects of field stimulation for 2 min at 30 V and either 1 Hz (N=5), 8 Hz (N=14) or 20 Hz (N=8) 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 in a perfused posterior cardinal vein preparation of rainbow rout. Values are means ± 1 S.E.M. A dagger denotes a significant difference (P<0.5) between pre-stimulated and stimulated samples (cross-hatched bars).