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Alignment of the m142, m143, and TRS1 proteins. Amino acid residues conserved between the three proteins are indicated by black boxes; similar residues are marked with open boxes. The alignment was generated with Multalign software (18). The TRS1 sequence was truncated at both ends, and only the overlapping part is shown. US22 gene family motifs I, III, and IV are marked. Periods represent gaps in gene sequences and nonconserved residues in the consensus sequence.
