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Brain levels of octopamine (OA), dopamine (DA) and serotonin (5HT) were compared between worker honey bees (Apis mellifera L.) kept with or without queens in various experiments. Levels of DA were significantly higher in queenless bees than in their sisters that had been kept with queens either (1) in small field colonies for 30 days or (2) in incubator cages through 18 days. This difference was...
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