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Multiple-sequence alignment of the E1 fusion domain. The SDV E1 putative fusion domain was aligned with some alphavirus E1 glycoproteins by using Multalin software (9). Abbreviations and accession numbers are as described in the legend to Fig. 7. Asterisks and colons represent identical and similar amino acids, respectively. Residues in boldface are the invariant amino acids in all viruses except SDV (see text).
