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Fig. 9. The effects of hypoxia followed by electrical stimulation (30 V and 8 Hz) on (A) noradrenaline (unfilled bars), adrenaline (filled bars) and total catecholamine (sum of noradrenaline + adrenaline) and (B) nitric oxide (NO) secretion rates in untreated preparations (N=6; no cross-hatching) and in preparation treated with saponin (N=6; cross-hatched bars). Values are means ± 1 S.E.M. A dagger denotes a significant effect (P<0.5) of hypoxia or electrical stimulation. An asterisk denotes a significant difference (P<0.5) between the control and the saponin-treated group.





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