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The enhancer element of the human histo-blood group ABO glycosyltransferase gene has been demonstrated to be located −3.7 kb upstream from the transcription start site and to be composed of four tandem repeats of a 43-bp unit. Recently we identified three different enhancer structures among the allelic A, B, and O glycosyltransferase genes. The enhancer structure with four 43-bp units is present in...
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