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Amino acid alignment of the matrix protein of phocine distemper virus (PDV) strains PDV/USA2006, PDV/Ulster88n, PDV/NL88n, and PDV/UK3541. The first 233 nt of the matrix gene of PDV/3541UK, as indicated by a dotted line, are undetermined. Large boxes indicate amino acid changes and small boxes the position of silent mutations.
