FACS analysis of surface ▵LNGFR expression in erythroblastic (K562 and MEL) and nonerythroblastic (3T3 and Kasumi-1) cell lines transduced by ▵SFCM (solid lines), GATA-SFCM (dotted lines), and SFCM (bold lines) vectors. Cells were stained with FITC-conjugated anti-LNGFR antibody.