Northern blot analyses of μ and α-globin expression. The hybridizations of erythroid tissues with α-globin (A) and μ-globin (B) probes are shown with molecular weight positions on the right. CB indicates cord blood; AB, adult blood; FL, fetal liver; BM, adult bone marrow. (C) Multitissue Northern blot hybridized with α-globin (top) and μ-globin (bottom) probes.