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TAIL TATS  When researchers tattooed mouse tails, the only cells found with ink inside were macrophages. The tattoo appeared the same before (left) and after (right) ink-holding macrophages were killed, because it was recaptured by new macrophages.

Staphylococcus epidermidis petri dish

SKIN WIN Staphylococcus epidermidis, a species of bacteria that lives on human skin, grows here in a dish. Strains of this bacteria make a cancer-fighting compound that stops DNA synthesis.

tuberculosis bacteria

MARKING MICROBES  When tuberculosis bacteria, seen in this scanning electron micrograph, gobble up a new synthetic molecule, they glow under a microscope — making them easy to spot in tests.

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