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Table 1 Comparison of M2e sequence among vaccine and challenge strains

From: Prokaryote-expressed M2e protein improves H9N2 influenza vaccine efficacy and protection against lethal influenza a virus in mice

M2e sequence homology   
M2e Protein A/ chicken /Vietnam/27262/2009 (H5N1) MSLLTEVETPTRNEWECRCSDSSD
Inactivated vaccine A/ chicken /Korea/04163/2004 (H9N2) MSLLTEVETPTRNG WECK CSDSSD
  A/chicken/Korea/ma163 (H9N2) MSLLTEVETPTRNG WECK CSDSSD
Challenge virus A/aquatic bird/Korea/maW81/05 (H5N2) MSLLTEVETPTRNG WECK CSDSSD
  A/Philippines/82 (H3N2) MSLLTEVETPI RNEWG CRCN DSSD
  1. Amino acids in bold are the variant residues.