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HDIG domain This domain is found in a few known nucleotidyltransferes and in a large number of uncharacterized proteins. It contains four widely separated His residues, the second of which is part of an invariant dipeptide His-Asp in a region matched approximately by the motif HDIG. This model may annotate homologous domains in which one or more of the His residues is conserved but misaligned, and some probable false-positive hits.
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