Flow cytometric analysis of pooled aerolysin-resistant colonies. Day-14 BFU-Es (top row) or CFU-GMs (bottom row) were washed from methycellulose-containing plates. BFU-Es were stained with FITC-conjugated anti–glycophorin-A and PE-conjugated anti-CD59. CFU-GMs were stained with PE-conjugated anti-CD15 and FLAER. Vertical and horizontal axes represent fluorescence intensity compared with isotypic controls.