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Once Thought to be Asexual, Single-Celled Parasites Caught in the Act
Leishmania - single-celled parasites that cause infections of the skin and internal organs - have long been known to multiply asexually, like bacteria. But occasionally, researchers have found hybrid parasites that carry genetic material from more than one strain - or even more than one species - of Leishmania, suggesting that some kind of genetic mixing is going on.
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