“Horvath looked at the DNA of nearly 8,000 samples of 51 different healthy and cancerous cells and tissues. Specifically, he looked at how methylation, a natural process that chemically modifies DNA, varied with age.  The clock has already revealed some intriguing results. Tests on healthy heart tissue showed that its biological age – how worn out it appears to be – was around nine years younger than expected. Female breast tissue aged faster than the rest of the body, on average appearing two years older. Diseased tissues also aged at different rates, with cancers speeding up the clock by an average of 36 years.”

http://www.rawstory.com/rs/2013/10/20/scientists-discover-dna-body-clock/

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