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Fig. 6. Plasma concentrations (mmol l-1) of Na+ ({square}), Cl- ({blacksquare}) and urea ([UNK]) following controlled haemorrhage of approximately 5.7% of total blood volume in Scyliorhinus canicula (N=6). Results are expressed as means + S.E.M. Statistical comparisons were made with time zero. Plasma, Na+, Cl- and urea concentrations did not change significantly (Student's t-test).