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PER responsiveness of honey bees when drugs were applied 24 h before learning sessions. (A,B) bees treated with 10 ng or 100 ng of ACT or DEL, respectively. The learning performance is expressed as the percentage of PER to antennal stimulation with 40% sucrose solution. Each group represents n = 90 bees. Bars represent standard errors. Acetamiprid (ACT), deltamethrin (DEL), and control groups (Ctl).
