TABLE 4.

HA connecting peptide sequences of H9N2 viruses

Virus	Connecting peptide amino acid sequence	Reference
A/turkey/Wisconcin/66	P A V S S R	19
A/quail/Arizona/29209/93	P A A S N R	9
A/duck/Hong Kong/168/77	P A A S G R	9
A/duck/Hong Kong/784/79	P A A S D R	9
A/chicken/Beijing/1/94	P A R S S R	9
A/quail/Hong Kong/G1/97	P A R S S R	9
A/chicken/Hong Kong/G9/97	P A R S S R	9
A/Hong Kong/1073/99	P A R S S R	13
A/parakeet/Chiba/1/97	P A R S S R	This study
A/parakeet/Narita/92A/98	P A R S S R	This study