Table 1. Potential glycosylation sites on HA in different influenza viruses.

Location	HA1										HA2
	Stalk		Side of head			Top of head Side of head		Side of head			Stalk
	27	28	40	81	104	142	212	286	293	297	304	498
SW731	√	√	√		√				√		√	√
CA04	√	√	√		√				√		√	√
SW26	√	√	√				√					√
PR8	√	√	√					√			√	√
WSN	√	√				√		√				√
ZB07		√		√		√				√	√	√
LY08		√		√		√				√	√	√

√ represents the presence of glycosylation sites. The glycosylation sites only present in SW731and CA/04 were highlighted in bold.