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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 105 mol l1
5-HT is significantly larger than that at 5x105 mol
l1 (P<0.05).
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