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Antigenic cartograph of influenza viruses, constructed by AntigenMap (http://sysbio.cvm.msstate.edu/AntigenMap) using hemagglutination inhibition titers. Pink, δ-cluster reference antisera; green, neutralization-sensitive influenza virus isolates; red, neutralization-resistant influenza virus isolates; blue, reverse genetics-derived isolate 11-0854 (RG 11-0854-1) and N144T mutant; yellow, reverse genetics-derived isolate 10-0036-2 (RG 10-0036-2) and T144N mutant.
