Table 1. Sequence of matrix protein 2(M2) ectodomains.

Strain	Subtype	M2e sequencea,b
A/Puerto Rico/8/1934	H1N1	SLLTEVETPIRNEWGCRCNGSSD
A/Chicken/Jiangsu/7/2002	H9N2	SLLTEVETP TRN GWGCRC SDSSD
A/environment/Dongting Lake/Hunan/3–9/2007	H10N8	SLLTEVETP TRN GW EC KC SDSSD
A/Duck/Hubei/5/2010	H6N6	SLLTEVETP TR SGW EC NC SDSSD

^aVariation from the PR8 M2e sequence are in boldface and underlined.

^bVirus sequence available at www.ncbi.nih.gov/genomes/FLU.