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  One of many light-sensitive pigments was found to set the retina’s own biological tempo while others set the body’s master clock. - Researchers at Johns Hopkins and the University of Washington report new research that sheds light on how the retina sets its own biological rhythm using a novel light-sensitive pigment, called neuropsin, found in nerve cells at the back of the eye.“No one knew what neuropsin actually did,” says King-Wai Yau, Ph.D., a professor of neuroscience at Johns Hopkins School of Medicine. “We only knew it existed in the mammalian genome and may help set the timing of reproduction for some birds. Now we think we know what it does in mammals.” The new study, descri dunk nike low bed in the journal Proceedings of the National A nike store dunk cademy of Sciences, ushers in a more complex view of the retina, according to Zheng Jiang, Ph.D., a postdoctoral fellow and one of the authors of the paper.Neuropsin is one of seven related “opsin&rdquo air force 1 ; proteins in ma  Apple chief executive Tim Cook paid a visit to Chinese bike-sharing company ofo on Tuesday, as the country's ride-sharing start-ups fight aggressively for investor dollars and market share.Cook visited the office of the Beijing-based start-up, known for its yellow bikes, and met with founding members including CEO Dai Wei, according to Cook new balance beige 's microblog and ofo.Apple CEO calls for more global trade with China"T new balance hombre hanks for welcoming me today, ofo team! Great energy behind your mission to make commuting greener, more efficient and fun!" Cook said in his official Sina Weibo post, along with pictures of him riding an ofo bike.Cook's visit comes amid a fierce contest for users and investors among China's bike-sharing start-ups new balance 327 , which has drawn in large global tech investors. The competition is frequently compared to a similar battle for the ride-sharing market between Uber Technologies and local rival Didi Chuxing a year ago.Ofo, which counts Didi as an investor, said Cook came for a company v