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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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ScienceShot: Horse Variety Predates Domestication
21 November 2011 5:20 pm
Today's horses come in a variety of colors and sizes, but don't credit humans. According to a new study, most of these traits existed long before we domesticated them. As researchers report online this month in BMC Evolutionary Biology, they analyzed the complete mitochondrial genome—the DNA found within cell's energy powerhouses—of 45 diverse horse breeds, looking for clues to the timing of horse domestication. They found that modern horses arose nearly 7000 years ago, a result that agrees with previous studies. The data also show that the ancestor of all domestic horses—which some scientists believed lived as long as 1 million years ago—roamed much more recently, between 38,000 and 93,000 years ago. In addition, more than 70% of today's horse lineages already existed before domestication, suggesting that a large number of wild founder mothers were used to build up the modern horse population.
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