Last month, US National Academy of Sciences announced (宣布) its new members. There were 100 US members and 25 foreign associates (院士). Chinese scientist Yan Ning, a 41-year-old biology professor (教授) at Princeton University, is one of them. Yan’s team found the structure (结构) of an important human protein (蛋白质) in 2014. They were the first people to find it. The protein may help scientists treat cancer (癌症).