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Alignment of IgH μ enhancer sequences. Sequences of IgH μ enhancer from four different species (GenBank accession no. V01523 for mouse, M13799 for rat, K01901 for human, and X13700 for rabbit) were aligned by using the Pileup program in the Wisconsin package version 8.1 (Genetics Computer Group, Madison, Wis.). Elements containing previously identified recognition motifs are overlined, and positions where the nucleotides from all species are identical are indicated by asterisks.
