The levels of histone acetylation corrected by an external mouse reference gene. (A) Comparison of acetylation levels of the mouse genes between the mixtures of MEL/fetal liver and MEL/adult erythroblasts. (B) Comparison of histone acetylation levels between fetal and adult erythroblasts at the promoters and exon 2 of the ε-, γ-, and β-globin genes using the mouse Aire gene as an external control. (C) Comparison of histone acetylation levels between fetal liver (∼day 100) and adult erythroblasts in the LCR region. (D) Comparison of histone acetylation levels between day 55 and day 100 fetal livers using the mouse Aire gene as control.