Schematic for use of murine fetal liver–derived primary megakaryocytes. (A) Illustration of the procedure for isolating mature megakaryocytes from murine fetal liver cells. (B) May-Grunwald/Giemsa stain of the initial cell mixture 12 hours after isolation and dispersion into culture media, and after 8 days of growth in media (original magnification of both images = 500-fold). (C) AchE stain of the initial cell mixture 12 hours after isolation and dispersion into culture media, and after 8 days of growth in media (original magnification of both images = 500-fold).