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Mth938-like domain. The members of this family include: Mth938, 2P1, Xcr35, Rpa2829, and several uncharacterized sequences. Mth938 is a hypothetical protein encoded by the Methanobacterium thermoautotrophicum (Mth) genome. This protein crystallizes as a dimer, although it is monomeric in solution, with one disulfide bond in each monomer. 2P1 is a partially characterized nuclear protein which is homologous to E3-3 from rat and known to be alternately spliced. Xcr35 and Rpa2829 are hypothetical proteins of unknown function from the Xanthomonas campestris and Rhodopseudomonas palustris genomes, respectively, for which the crystal structures have been determined.