Phenotypic properties of various lineage-committed progenitors. The results shown in Tables 1 and 2 are summarized. The phenotype of cells that gave rise to pure mast cell colonies was mainly CD34⁺CD38⁺HLA-DR⁻ and that of erythroid progenitors was CD34⁺CD38⁺HLA-DR⁺. Cells that gave rise to pure macrophages, neutrophils, or eosinophils were found in various phenotypes of CD34⁺ cells.