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Fig. 4. Effect of olfactory stimulation with methionine (10-3 mol l-1) on the ERG b-wave sensitivity. Changes of the b-wave threshold after application of either methionine or regular tank water were determined at early morning, 06.00–19.00 h and late morning, 09.00–12.00 h. Values are means ± S.E.M.; n.s., not significant; ***P<0.001.