No difference in mitochondrial ATP production between MDS and NBM. (A) Mitochondrial ATP production rate (MAPR) was measured in CD34^- cells from 2 NBM, 3 RA, and 5 RARS samples. There was no significant difference between MDS and NBM. Moreover, G-CSF did not have any significant effect on the MAPR determined with the substrate combination glutamate + succinate. (B) MAPR was measured with the substrate combination TMPD + ascorbate. There was no significant difference in ATP production between MDS and NBM. In addition, G-CSF did not influence the results in this system.