Table 3.

Annual selection, fraction of positions under selection, and diversity in epitopes A to E, positions not in any of the epitopes, and the whole HA1 sequence.

region	selection	fraction of positions under selection	diversity
epitope A	0.187	0.152	0.077
epitope B	0.157	0.134	0.062
epitope C	0.077	0.087	0.048
epitope D	0.100	0.072	0.037
epitope E	0.111	0.094	0.049
out of epitopes	0.021	0.019	0.013
the whole sequence	0.060	0.051	0.028