Cytological observation of Wrights-stained untreated cells, and RA-treated vector control, c-Cbl+, G306E, and C381A stable transfectants. Cells were treated with 1.0 μm RA for 4 days and stained with Wrights stain. More than 50 cells were inspected, and images were taken using the ×100 objective. Cytological data are consistent with differentiation assays.