Allele-specific RNA PCR. (A) The RNA PCR product from both adult α-globin genes of most non-AKR strains is bisected by an MspI restriction site. (B) Allele-specific RNA PCR on blood from HS26^{+(nonAKR)/+(AKR)} non-AKR × AKR F1 mice. Controls are water (W) and C57BL6 (B6). (C) Allele-specific RNA PCR on bone marrow from HS26^{floxed(nonAKR)/+(AKR)}, HS26^{+(nonAKR)/+(AKR)}, and HS26^{ΔNFE2(nonAKR)/+(AKR)} non-AKR × AKR F1 mice.