http://medicalxpress.com/ en-us Medical Xpress internet news portal provides the latest news on Health and Medicine. (Medical Xpress)—A study dating the age of more than 1 million single-letter variations in the human DNA code reveals that most of these mutations are of recent origin, evolutionarily speaking. These kinds of mutations change one nucleotide – an A, C, T or G – in the DNA sequence.  Over 86 percent of the harmful protein-coding mutations of this type arose in humans just during the past 5,000 to 10,000 years. http://medicalxpress.com/news/2012-11-genetic-variation-varies-populations.html Genetics Wed, 28 Nov 2012 13:00:37 EST news273327980