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Figure 5


Fig. 5. The mean percentage of the original cross-sectional area of water tubes in isolated gills exposed to 5-hydroxytryptamine (5-HT). Sample size: N=2 measurements made on each of six pieces of gill. Data are means ± s.e.m. The mean at 10–5 mol l–1 5-HT is significantly larger than that at 5x10–5 mol l–1 (P<0.05).





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