Fig. 1. Typical electro-olfactogram (EOG) responses elicited by the monoamine and polyamine odorants and the amino acid standard L-glutamine. The chemical structure, common name and abbreviation (in parentheses) of each odorant is shown below the response. The peak response was used to quantify response magnitude. All responses were obtained from the same fish. Odorants were tested at the concentration of 100 µmol l^–1.