CONTEXTUAL MEANING IN DNA. “The duons are like words or phrases within the “text” of our DNA that mean two different things, depending on context. And yet, as in human language, not all words have this double meaning. The Science paper suggests that these duons are “highly conserved” through evolution, which means that they are the Darwinian keepers.”
http://www.forbes.com/sites/anthonykosner/2013/12/13/seven-ways-to-look-at-the-double-meaning-of-dna-code/#2715e4857a0b7e447793109a