Expression of the erythroid and megakaryoblastic specific genes in the murine erythroleukaemia cell line HB22.2 during hemin-induced differentiation. (A) Semi-quantitative RT-PCR analysis of 6 erythroid specific genes (E) and 4 megakaryoblastic specific genes (Mk). The first lane (M) indicates the low-range DNA marker. (B) Hemin-induced differentiation assay of HB22.2 cells. Semi-quantitative RT-PCR analysis of Hba as differentiation control, Btbd14a and Ltbp2 was performed in non-induced (NI) and induced (Hemin) cells at day 1 (D1) and day 3 (D3) following hemin addition. GAPDH expression was used as internal control. Three independent RT-PCR reactions were performed on each sample using increasing amount of the RT reaction (0.75 volume, 1 volume, 1.25 volume). The band intensity was measured and indicated below each band. On the right half of the figure, the histograms show the average results of the band intensities relative to the Gapdh control sample.