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Fig. 2. Diurnal ammonia excretion (JAmm) (A) and urea excretion (JUrea) (B) in wild-caught Rivulus marmoratus. Values are expressed as means + S.E.M. (N=14). Columns labelled with one or more letters that are the same are not significantly different. Columns labelled with no letters in common are significantly different (P<0.05).