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Amber Tripodi with ELISA assay vial

Amber Tripodi with ELISA assay vial

To determine whether a bee has been marked with egg-white powder, entomologist Amber Tripodi, Ph.D., rinses it in buffer solution in a small vial. The bee is released, wet but otherwise unharmed, and the solution is then tested for the chemical signature of the powder. (Photo credit: Theresa Pitts-Singer, Ph.D.)

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