Percentage of CD4⁺ cells during HPC (▵), monocytic (○), megakaryocytic (•), granulocytic (□), and erythroid (▪) differentiation (mean ± SEM values from 4 separate experiments). Cells from unilineage culture, collected at the indicated days, were labeled with PE-conjugated Leu3A MoAb and analyzed by FACS for fluorescence intensity.