Propolis is a sticky resin that seeps from the buds of certain trees (the bees prefer poplar) and oozes from the bark of others (chiefly conifers). Worker bees collect it; add their salivary secretions to it, and use it to coat the inside of the hive. Propolis has been shown to contain antibacterial compounds and can be effective as a salve for cuts and bruises.
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