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Fig. 4. The change in the mean (± s.e.m.) interfilament space when isolated
gills were exposed to 5-hydroxytryptamine (5-HT). Treatments: 0, initial
measurements on untreated, quiescent gills; 105 mol
l1 and 5x105 mol
l1, the same pieces of gill after exposure to increasing
concentrations of 5-HT. Sample size: N=8 measurements made on each of
two pieces of gill. All of the means are significantly different from each
other (P<0.05).