Geest CR, Zwartkruis FJ, Vellenga E, Coffer PJ, Buitenhuis M. Mammalian target of rapamycin activity is required for expansion of CD34+ hematopoietic progenitor cells. Haematologica 2009; 94(7):901-910; https://doi.org/10.3324/haematol.13766.