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Øystein L. Holla; Jon K. Laerdahl; Thea Bismo Strøm; Kristian Tveten; Jamie Cameron; Knut Erik Berge; Trond P. Leren. (2011). Removal of acidic residues of the prodomain of PCSK9 increases its activity towards the LDL receptor. , 406(2), 0–238. doi:10.1016/j.bbrc.2011.02.023 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research