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NEW YORK:An injury-ravaged US Open men's draw offers the best opportunity yet for a young pretender to claim a maiden grand slam crown but in this most retro of seasons Roger Federer and Rafael Nadal will look to turn back time in New York.With the physical demands of modern-day tennis taking its toll the tournament will start without four of the top 11 in the ATP rankings including defending champion Stan Wawrinka who ended his season early with a knee i adidas samba vegan njury.Twice champion Novak Djokovic (elbow), 2014 runner-up Kei Nishikori (wrist) and M adidas campus rose ilos Raonic (wrist) are also absent while 2012 champion Andy Murray and 2014 winner Marin Cilic have been sidelined since Wimbledon by injuries.Montreal Masters: Dominant Federer fires into semisFederer, looking to win three grand slam titles in the same year for the first time since 2007 newbalance 530 , withdrew from Cincinnati with a back niggle and while Nadal, who returned this week to world number one, is fit, his form of late has been patchy.All the more reas A Penn State-led team of interdisciplinary researchers has developed techniques to improve the efficiency of CRISPR-Cas9, the genome editing technique that earned the Nobel Prize in 2020. While CRISPR-Cas9 is faster, less expensive and more accurate than other gene-editing methods, according to project leader Xiaojun 鈥淟ance鈥?Lian, associate professor of biomedical engineering and biology at Penn State, the technology has limitations 鈥?especially in applications to improve human health. The researchers developed a more effi new balance 9060 cient and accessible process to apply CRISPR-Cas9 systems in human pluripotent stem cells (hPSCs), derived from federally approved stem cell lines, which Lian said nike store dunks could greatly advance diagnostics and treatments for genetic disorders.CRISPR-Cas9, which stands for clustered regularly interspaced short palindromic repeats and CRISPR-associated protein 9, gives scientists the ability to target precise locations of genetic code to change DN air force1 A, providing opportunities to