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The Lifestyles of the Fish and Famous -- on Extra Oxygen (5 of 14)

Caption: This is Dr. Jennifer Burns, University of Alaska, Anchorage, with a young harp seal pup in Eastern Canada. Adult harp seals have some of the highest concentrations of the oxygen-storing protein myoglobin in their muscles and have been recorded to hold their breath and dive for 20 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 M. Hammill]

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