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Background The MucA’ and MucB proteins comprise the core of DNA polymerase RI which is a strong mutator utilized in mutagenicity assays such as the standard Ames test. A close relative DNA polymerase V, composed of the homologous UmuD’ and UmuC proteins, is considered to be an ortholog of the mammalian DNA polymerase η. The catalytic subunits of these polymerases belong to the Y-family which specializes...
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