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A DNA molecule that is methylated on both strands on the center cytosine. Christoph Bock, Max Planck Institute for Informatics.

Steven Austad , of the Barshop Institute for Longevity and Aging Studies, at the University of Texas Health Science Center at San Antonio, has applied the longevity quotient--which he developed--to many species, including those depicted here.

Steven Austad , of the Barshop Institute for Longevity and Aging Studies, at the University of Texas Health Science Center at San Antonio, has applied the longevity quotient--which he developed--to many species, including those depicted here.