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SMEK domain The SMEK domain is named for four genera in which multiple, diverse members of this uncommon family of bacterial proteins are found: Staphylococcus, Mycoplasma, Escherichia, and Klebsiella. Members of the family are highly variable in length. This domain occurs as the N-terminal region. The four scattered invariant residues in the seed alignment, which may provide a clue to function, are Glu, Asp, Gln, and Lys.
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