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Table 5 Comparison of antigenic sites in amino acid sequences of hemagglutinin proteins (H9N2).

From: Avian influenza A (H9N2): computational molecular analysis and phylogenetic characterization of viral surface proteins isolated between 1997 and 2009 from the human population

1997

1998

1999

2003

2008

2009

A/Hong Kong/1074/97

A/Shantou/239/98

A/Shaoguan/408/98

A/Shaoguan/447/98

A/Hong Kong/1073/99

A/Hong Kong/1074/99

A/Guangzhou/333/99

A/Hong Kong/2108/03

A/Hong Kong/3239/08

A/Hong Kong/33982/2009

A/Hong Kong/35820/2009

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

Position

Sequence

431

AYNAELLVL

414

AYNAELLVL

414

AYNAELLVL

253

GESHGRILK

431

AYNAELLVL

414

AYNAELLVL

421

AYNAELLVL

423

AYNAELLVL

423

AYNAELLVL

108

CYPGNVENL

91

CYPGNVENL

91

CYPGNVENL

473

IRNGTYNRR

108

CYPGNVENL

91

CYPGNVENL

98

CYPGNVENL

100

CYPGNVENL

100

CYPGNVENL

236

GRIDYYWSV

219

GRIDYYWSV

428

TLDDHDANV

219

GRIDYYWSV

236

GRIDYYWSV

219

GRIDYYWSV

226

GRIDYYWSV

228

GRIDYYWSV

228

GRIDYYWSV

312

GTCPKYVRV

117

IFPDTIWNV

219

GRIDYYWSV

360

DSTQKAIDK

312

GTCPKYVRV

82

ERPSAVNEM

124

IFPDTIWNV

126

IFPDTIWNV

304

GTCPKYVKV

134

IFPDTTWNV

392

SEVENRLNM

117

IFPDTIWNV

396

TRLNMINNK

134

IFPDTTWNV

117

IFPDTIWNV

314

KLAVGMRNV

316

KLAVGLRNV

316

KLAIGLRNV