"When honeybees shift from nurse bees to foragers, or from caring for the brood to foraging for nectar and pollen, the bees turn on gene expression with products that protect against microorganisms and degrade toxins, three University of California, Davis, scientists have discovered. ..."
Read more here: ucdavis.edu
(Paper: The journal article, titled Forager Bees (Apis Mellifera) Highly Express Immune and Detoxification Genes in Tissues Associated with Nectar Processing,nature.com)