Table 3. Amino acid differences of the HA proteins between rH1N1 and pBJ09 viruses^a.

	Amino acid position in HAb
Virus	79	92	112	127	135	136	146	149	171	206	212	219	227	259	260	263	273	300	316	323	347	358	376	445	475
rH1N1	F	N	E	N	D	R	G	R	N	S	K	T	A	I	K	S	S	V	M	I	I	D	G	M	D
pBJ09	S	S	D	S	M	K	S	K	D	T	T	I	E	M	E	A	P	I	L	V	V	E	K	K	N

^aAmino acids in the HA receptor binding site are bold.

^bH3 numbering.