Strict erythroid specificity conferred by the HA promoter within the LG vector. Mean percentages and individual values of eGFP-positive cells in BM (B lymphoid [B], myeloid [M], and erythroid [E]), thymus (T lymphoid [T]), and peripheral blood (B, M, T, and RBCs) of normal mice transplanted with (top) LG/HA-eGFP or (bottom) HPV570 (Ef1α-eGFP) transduced cells. For leukocytes, donor cells were identified by mean of the CD45.2 antigen. For erythroid cells, this could not be performed. As a consequence, the proportion of eGFP-positive erythroid cells may be slightly greater than what is presented.