| 
      Symbols are used here and in the following Tables and Figures:
        | Gene | Nucleotide | Protein | Amino acid |  
        | No. | Lwt1 | L17-MDV2 | VN/H5N1-RG LAIV3 | VN/H5N2 LAIV4 | t/T/H5N2 LAIV5 | No. | Lwt | L17-MDV | VN/H5N1-RG LAIV | VN/H5N2 LAIV | t/T/H5N2 LAIV |  
        | PB2 | 1459 | G | T | T | T | T | PB2 | 478 | Val | Leu | Leu | Leu | Leu |  
        | PB1 | 360 | G | A | A | A | A | PB1 | 112 | Glu | Glu | Glu | Glu | Glu |  
        | 819 | G | T | T | T | T | 265 | Lys | Asn | Asn | Asn | Asn |  
        | 1795 | G | A | A | A | A | 591 | Val | Ile | Ile | Ile | Ile |  
        | 1011* | A | A | A | G | A | 329* | Gln | Gln | Gln | Gln | Gln |  
        | PA | 107 | T | C | C | C | C | PA | 28 | Leu | Pro | Pro | Pro | Pro |  
        | 222 | T | C | C | C | C | 66 | Asp | Asp | Asp | Asp | Asp |  
        | 1045 | G | T | T | T | T | 341 | Val | Leu | Leu | Leu | Leu |  
        | NA | 765* | G | G | G | T | T | NA | 249 | Arg | Arg | Arg | Ile | Ile |  
        | 1116 | T | C | C | C | C | 366 | Ile | Thr | Thr | Thr | Thr |  
        | M | 68 | A | G | G | G | G | M1 | 15 | Ile | Val | Val | Val | Val |  
        | 457 | T | G | G | G | G | 144 | Phe | Leu | Leu | Leu | Leu |  
        | NS | 798 | G | A | A | A | A | NS2 | 100 | Met | Ile | Ile | Ile | Ile |  
        | HA | 50* | - | - | T | C | - | HA | 8 | - | - | Phe | Leu | - |  
        | 417* | - | - | T | C | - | 130 | - | - | Ile | Thr | - |  1Lwt corresponds to A/Leningrad/134/57 (H2N2) wild-type virus, a precursor of A/Leningrad/134/17/57 
      (H2N2) MDV;
 2L17-MDV corresponds to A/Leningrad/134/17/57 (H2N2) MDV;
 3VN/H5N1-RG LAIV corresponds to A/17/Vietnam/1203/04-RG (H5N1) LAIV candidate;
 4VN/H5N2 LAIV corresponds to A/17/Vietnam/04/65107 (H5N2) LAIV candidate;
 5t/T/H5N2 LAIV corresponds to A/17/turkey/Turkey/05/133 (H5N2) LAIV candidate.
 *additional mutations of H5N2 LAIV candidates
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