Cytological analysis of hematopoietic colonies. Cells were recovered from G-CSF–stimulated methylcellulose cultures of WT- (A and D), d716- (B and E), or GEpoR- (C and F) transduced cells. Cells were analyzed by Wright stain (A through C) or chloroacetate esterase stain (D through F). Shown are representative results of one of four experiments. Original magnification × 1,110.