Table 4. Antigenicity-associated sites of H3N2 identified using the random forest regression algorithm.

Order of variable importance	Amino acid position
1	189
2	133
3	193
4	145
5	155
6	144
7	159
8	216
9	156
10	158
11	163
12	135

Experimentally validated sites were marked as bold. Accessory substitutions were marked as italic.