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Fig. 3. Effects of an intraperitoneal injection with saline (0.9% NaCl, control) or a sublethal dose (8 µmol g-1 fish) of CH3COONH4 on the contents (µmol g-1) of ammonia (open), glutamine (filled) and glutamate (hatched) in the brains of Periophthalmodon schlosseri. *Significantly different from the corresponding saline-injected control value.