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Fig. 7. The effect of the nitric oxide synthase inhibitor L-NAME
(105 mol l1) on 5-hydroxytryptamine
(5-HT)-induced clearance rates during the winter. Treatments are either gills
that were exposed to 5-HT or gills exposed to both 105 mol
l1 L-NAME and 5-HT; the ratios are as described
in the text. Data are means ± s.e.m.; sample size ranged from 6 to 14.
At 105 mol l1 5-HT, the means are
significantly different (P<0.05).