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Inhibition of the response to sugars by bitter chemicals (Sellier, 2010). (A) Adding increasing concentrations of quinine to 35 mM fructose inhibits the firing activity recorded from L-type sensilla of the proboscis of Drosophila. (B) At the same molar concentration (1 mM), bitter chemicals differ in their power to inhibit the response to 0.1 M sucrose. Each point represents the average of 5–10 responses. Bars display SEM.
