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weed out the slightly bad variants, a group of researchers from the University of California, cheap wholesale 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 air jordans , Harris and Nielsen say. On the whole, the researchers argue, cheap jordans free shipping , 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, a gene Tibetans inherited from Denisovans allowed them to adapt to high altitudes (SN: 8/9/14, p. 8), cheap retro jordans . 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 jordans online , forces and threats humans have faced over the course of evolution, cheap jordans for sale , pathogens have been one of the greatest,” says Lluis Quintana-Murci, http://cheapjordansstock.com , 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 Authentic jordans , Quintana-Murci and colleagues report in the http://highthabu-espor...rum_topic&topic=13733 http://www.regards-publicite.com/ http://www.elllo.org/graphics/ |