Free energy simulations reveal a double mutant avian H5N1 virus hemagglutinin with altered receptor binding specificityPayel DasJingyuan Liet al.2009Journal of Computational ChemistryPaper
Single mutation induced H3N2 hemagglutinin antibody neutralization: A free energy perturbation studyRuhong ZhouPayel Daset al.2008Journal of Physical Chemistry BPaper