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Sundstrom, M.; Lundqvist, T.; Rodin, J.; Giebel, L. B.; Milligan, D.; Norstedt, G. . (1996). Crystal Structure of an Antagonist Mutant of Human Growth Hormone, G120R, in Complex with Its Receptor at 2.9 A Resolution. Journal of Biological Chemistry, 271(50), 32197–32203. doi:10.1074/jbc.271.50.32197 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research