Drupal-Bibcite0<style face="normal" font="default" size="100%">Two amino acid residues in the matrix protein M1 contribute to the virulence difference of H5N1 avian influenza viruses in mice</style><style face="normal" font="default" size="100%">Two amino acid residues in the matrix protein M1 contribute to the virulence difference of H5N1 avian influenza viruses in mice</style>