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Fig. 8. The effects of calcium free saline (N=6; cross-hatched bars) on in situ (A) noradrenaline (filled bar), adrenaline (unfilled bar) and total catecholamine (sum of noradrenaline + adrenaline) and (B) nitric oxide (NO) secretion rates in response to electrical stimulation at 30 V and 8 Hz. Values are means ± 1 S.E.M. A dagger denotes a significant difference (P<0.5) between pre-stimulated and stimulated groups. An asterisk denotes a significant difference (P<0.5) between the control (N=6) and the Ca2+-free treated group (cross-hatched).