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Caption: A male hooded seal on the pack ice off Eastern Canada. Hooded seals have the highest ever recorded concentrations of the oxygen-storing protein myoglobin in their muscles and are known to dive for up to 52 minutes. This image relates to a paper that appeared in the June 14, 2013, issue of Science, published by AAAS. The paper, by Scott Mirceta at University of Liverpool in Liverpool, UK, and colleagues was titled, "Evolution of Mammalian Diving Capacity Traced by Myoglobin Net Surface Charge."
Credit: [Image courtesy of J. Burns]
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