Fig. 4. Examples from two cross-adaptation experiments demonstrating that the amino acid L-glutamine (Gln) and the polyamine spermine (Spm) interact with different odorant receptors. Electro-olfactogram (EOG) responses to 100 µmol l^–1 glutamine and 100 µmol l^–1 spermine were selectively attenuated when the background bathing the olfactory epithelium was switched from AFW to (A) 100 µmol l^–1 glutamine and (B) 100 µmol l^–1 spermine, respectively. Responses to glutamine (upper traces) or spermine (lower traces) before (Pre), during (x-adapt) and after (Post) exposure to a background odorant are shown for each adapting odorant. Data plotted in A and B were obtained from two different fish.

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