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. 2011 Apr 29;6(4):e18956. doi: 10.1371/journal.pone.0018956

Table 3. Amino acid substitutions in HA and NA segments discriminating clusters.

HA NA
S220T V106I N248D
cluster 1 S V N
cluster 1.2 S I N
cluster 1.3 S I D
cluster 2 T I D

Data are from the present study and [13], [14].