Sanada C, Xavier-Ferrucio J, Lu Y-C, et al. Adult human megakaryocyte-erythroid progenitors are in the CD34⁺CD38^mid fraction. Blood. 2016;128(7):923-933.

On page 924 of the 18 August 2016 issue, a source of cytokines is incorrect. In line 7 under “Modified MegaCult assays,” “PeproTech (Rocky Hill, NJ)” should read, “ConnStem (Cheshire, CT).” The error has been corrected in the online version, which now differs from the print version.