Immunocytochemical staining for ▵LNGFR in pools of BFU-E (left) and CFU-GM (right) colonies from methylcellulose clonal cultures of CD34⁺ hematopoietic progenitors transduced with the SFCM (upper panels) and GATA-SFCM (lower panels) vectors. ▵LNGFR⁺ cells appear in red after APAAP staining. The bar is 10 μm.