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Luo, Yonghua; Yogesha, S. D.; Cannon, Joe R.; Yan, Wupeng; Ellington, Andrew D.; Brodbelt, Jennifer S.; Zhang, Yan . (2013). Novel Modifications on C-terminal Domain of RNA Polymerase II Can Fine-tune the Phosphatase Activity of Ssu72. ACS Chemical Biology, 8(9), 2042–2052. doi:10.1021/cb400229c 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research