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Amino acid sequence comparison of the M protein fragments (residues 191 to 213) of pneumoviruses. M protein sequences of APV-A (GenBank accession no. X58639), APV-B (U37586), APV-C (AF262571), HRSV B (AAB82433), human metapneumovirus (HMPV) (AF371337), BRSV (NC_001989), ovine RSV (ORSV) (U02470), and pneumonia virus of mice (PVM) (U66893) were aligned by the ClustalW method (DNAStar, Madison, Wis.). The putative L domain (YxGL) spanning residues 197 to 200 is shaded.
