Morphological characteristics of UT-7/GM cells in liquid culture. Cytospin smears of May-Giemsa–stained UT-7/GM cells cultured with GM-CSF (A; original magnification × 400), TPO (B; original magnification × 400), or EPO (C; original magnification × 400), and dianisidine-stained UT-7/GM cells shown in C (D; original magnification × 250). UT-7/GM cells were cultured with GM-CSF (10 ng/mL), TPO (100 ng/mL), or EPO (10 U/mL). One month later, the cells were obtained for the preparation of cytospin smears.