Comparison of the major subpopulations of mtDNA mutants among CD34⁺ cells, T cells, B cells, and granulocytes. Major subpopulations of mtDNA differences in each cell type were compared in each donor (donors 1-5). Each vertical axis represents the proportion of the cells bearing the major subpopulations of mtDNA mutants. “Other” indicates the total proportion of minor populations of mtDNA mutants.