CD4 and Menkes disease: There were significantly more CD4+ and CD8+ microchimeric cells in the muscle of patients with MD compared with controls (0.053 ± 0.020/mm2 vs. 0 ± 0/mm2 for CD4+ microchimeric cells [Fig. 1c, p = 0.003] and 0.043 ± 0.023/mm2 vs. 0 ± 0/mm2 for CD8+ microchimeric cells [Fig. 1d, p = 0.025]).