Effect of KLF2 on endogenous murine β-like globin gene expression at E12.5. The percentage of globin/GPA mRNA ratio was determined, and statistical analyses were performed as described in the legend of Figure 1. (A) Embryonic Ey-globin mRNA in the yolk sac, (B) embryonic βh1-globin mRNA in the yolk sac, and (C) adult β^maj-plus β^min-globin mRNA in the fetal liver.