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Background
An erythroid cell‐specific regulatory element (+5·8‐kb) in the first intron of ABO is responsible for the antigen differential expression and the regulatory activity of the element was affected by the nucleotide mutation in the +5·8‐kb region. Currently, many individuals with ABO subgroups were found in the Chinese population, but there was little information about the function of +5·8‐kb...
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