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Worker honeybees (Apis mellifera carnica Polm.) were treated with imidacloprid or coumaphos. Significant effects of treatment and treatment duration were found on hypopharyngeal glands (HPG) acinus diameter (P < 0.05). Differences in the size of acini were evident in all long term (48 h and 72 h) treatments. Short term (24 h) imidacloprid treatment induced heat shock protein 70 (Hsp 70) localisation...
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