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Fig. 7. The influence of experimental feeding (triangles) or the control treatment (circles) on (A) plasma urea-N (B) plasma ammonia-N and (C) plasma trimethylamine oxide-N (TMAO-N) concentrations in Squalus acanthias of Series 2. Note the different units (µmol l–1 for ammonia-N versus mmol l–1 for urea-N and TMAO-N). Values are means ± 1 S.E.M. (N=8). Other details as in legend of Fig. 1. There was a significant overall influence of experimental feeding only on plasma ammonia-N (two-way ANOVA, P x0.05) but not on plasma urea-N or TMAO-N.