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Polar bears older than previously thought

New analysis reveals the Arctic species dates back about 600,000 years

2:17pm, April 19, 2012

Polar bears might have originated about 600,000 years ago, an international team reports April 20 in Science.

Previously, studies suggested that the polar bear, Ursus maritimus, emerged much later, about 150,000 years back. But many of these estimates were based on analyzing limited genetic information that’s passed down only through the maternal bloodline called mitochondrial DNA.

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