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FILE ó In this Sept. 13, 2012 file photo, Massachusetts shark expert Greg Skomal pulls the cap off a blood sample taken from an Atlantic great white shark before performing blood gas analysis moments after the nearly 15-foot, 2,292-pound shark was released from the research vessel Ocearch off the coast of Chatham, Mass. Researchers in Massachusetts say great white sharks in the Atlantic Ocean are venturing offshore farther, with more frequency and at greater depths than previously known. The findings were published Sept. 29, 2017, in the scientific journal Marine Ecology Progress Series. (AP Photo/Stephan Savoia, File)