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Figueiredo, Lilian M.; Costa, Everton B.O.; Orellana, Maristela D.; Picanço-Castro, Virginia; Covas, Dimas T. . (2015). OP9 Stromal Cells Proteins Involved in Hematoendothelial Differentiation from Human Embryonic Stem Cells. Cellular Reprogramming, (), 150821133309006–. doi:10.1089/cell.2015.0014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research