A strong reduction in GSH content (Figure 1D) in the CPC subpopulation from BS patients with respect to controls was observed (CD34+/CD45−/dim: 8454 ± 1874 vs. 64,792 ± 7825; CD34+/CD45−/dim/CD133–: 3993 ± 1407 vs. 48,943 ± 7764; CD34+/CD45−/dim/CD133+: 17,598 ± 5101 vs. 67,828 ± 8206). This evidence concerns the gene PROM1 and Bloom syndrome.