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Negoda, Alexander; El Hiani, Yassine; Cowley, Elizabeth A.; Linsdell, Paul . (2017). Contribution of a leucine residue in the first transmembrane segment to the selectivity filter region in the CFTR chloride channel. Biochimica et Biophysica Acta (BBA) - Biomembranes, 1859(5), 1049–1058. doi:10.1016/j.bbamem.2017.02.014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research