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This photo provided by the University of Pittsburgh, Center for Biologic Imaging shows colorized scanning electron micrograph of red blood cells found in humans. (University of Pittsburgh, Center for Biologic Imaging via AP) ** FILE **

This photo provided by the University of Pittsburgh, Center for Biologic Imaging shows colorized scanning electron micrograph of red blood cells found in humans. (University of Pittsburgh, Center for Biologic Imaging via AP) ** FILE **

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