'Backpacking' bacteria

To the ranks of horses, donkeys, camels and other animals that have served humanity as pack animals or beasts of burden, scientists are now enlisting bacteria to ferry nano-medicine cargos throughout the human body. They reported on progress in developing these "backpacking" bacteria -- so small that a million would fit on the head of a pin -- here today at the 243rd National Meeting & Exposition of the American Chemical Society (ACS).

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