Researchers may have determined that human and chimp lines split more recently than previously thought. The study mentions interbreeding between the two lines after an initial split.

A detailed analysis of human and chimp DNA suggests the lines finally diverged less than 5.4 million years ago.

The finding, published in the journal Nature, is about 1-2 million years later than the fossils have indicated.

A US team says its results hint at the possibility that interbreeding occurred between the two lines for thousands, even millions, of years.

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Insert requisite Bush-monkey joke.