Table 4. Residue diversities between the HA1 sequences of Vietnam H5 hemagglutinins from H5N1 avian influenza viruses.

Virus	Residue positiona
	86	94	155	174	181	212	227	269	282	310	322
clade 1	V/A/I	D/N/V	S/N	V	P	R/K	E	L	M	R	Q
clade 2.1	A/T	S/N	S/N	V	P	K	E	L	M	R	Q
clade 2.2	A	N/D	N/D	V	P	K	E	L	I	R	Q
clade 2.3	A/V	N	N/D	I/V	S/P	K	D	V	I/M	K	L/Q

^aResidue position denotes the amino acid position in the mature HA protein sequence.