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Bee and brood production (mean ± SE) in Italian and Russian honey bee colonies having irradiated or non-irradiated (control) combs: (a) 2015 adult bees; (b) 2015 brood cells; (c) 2016 adult bees; and (d) 2016 brood cells. For each group, bars with the same letters are not significantly different (p > 0.05); without letters indicates no differences.
