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**__Related stories:__***linkurl:How epigenetics affects twins;http://www.the-scientist.com/article/display/22726/
[7 July 2005]*linkurl:Gene expression is noisy;http://www.the-scientist.com/article/display/22206/
[28 May 2004]*linkurl:The Meaning of Epigenetics;http://www.the-scientist.com/article/display/12615/
[17 September 2001] __Image: flickr/nicasaurusrex__