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Fig. 2. Typical electro-olfactogram (EOG) recordings to ascending concentrations of (A) L-arginine, (B) putrescine, (C) cadaverine and (D) spermine, performed in a single goldfish. Odorant concentrations (in mol l–1) eliciting each response are listed below each respective trace. C, charcoal filtered tapwater. Scale bars, 0.5 mV (vertical); 30 s (horizontal).