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weed out the slightly bad variants, cheap jordans for sale , a group of researchers from the University of California, cheap real jordans , Davis reports in a November 21 paper. Both groups agree that the burden of extra Neandertal mutations would have been a drag on early human-Neandertal hybrids. Europeans and Asians are still shouldering that mutational load today. Non-Africans are about 0.5 percent less evolutionarily fit than their African counterparts thanks to Neandertal DNA, cheap jordans free shipping , Harris and Nielsen say. On the whole, the researchers argue, Neandertals’ extremely narrow population bottleneck was bad for them and their modern human descendants. But a wealth of genetic data indicate that at least some genes inherited from humans’ extinct cousins were evolutionary windfalls. For instance, cheap jordans online , a gene Tibetans inherited from Denisovans allowed them to adapt to high altitudes (SN: 8/9/14, p. 8), http://cheapjordansstock.com . Some of the most Neandertal-rich regions of the modern human genome are those that contain immune system genes. There’s a good reason for that. “Of all the challenges, cheap retro jordans , forces and threats humans have faced over the course of evolution, pathogens have been one of the greatest, cheap jordan shoes ,” says Lluis Quintana-Murci, a population geneticist at the Pasteur Institute in Paris. Genes involved in the body’s first line of defense against pathogens are under strong evolutionary pressure not to change, cheap air jordans , Quintana-Murci and colleagues report in the http://www.zondik.com/video/showgroup/anyoshoes http://www.elllo.org/graphics/ http://www.regrbl.com/...opic.php?f=4&t=192329 |