Differential dystroglycan α expression in human CD34⁺ cells of the blood and marrow. (A) Real-time RT-PCR curves of dystroglycan α (dotted line) and the GAPDH control (solid line) of 1 representative of 4 experiments are shown. (B) Average differences of crossing points (ΔCP) of dystroglycan α and GAPDH for all examined PB-CD34⁺ (n = 4) and BM-CD34⁺ (n = 4) samples are displayed. The lines in each bar indicate one standard deviation. The average difference of ΔCPs (ΔΔCP) of PB and BM is indicated by the double-headed arrow (P = .01).