Comparison of amino acid positions related to antigenic variation of H1N1 seasonal influenza viruses identified by current and previous studies.

aTwenty-three antigenicity-associated sites identified by random forest regression.
bTwenty antigenicity-associated sites identified by support vector regression based on recursive feature elimination.
cForty-one natural epitope residues identified by Huang et al. [13].
dFifteen cluster-difference substitutions revealed by antigenic cartography.
eFive antigenic epitope regions described by Brownlee and Fodor [37].
Comparison of amino acid positions related to antigenic variation of H1N1 seasonal influenza viruses identified by current and previous studies.