TABLE 2.

Comprehensive structural alignment among N1 to N9, Flu B, N10, and N11

NA	PDB ID	RMSD (Å) of the Cα atoms of one NA monomer
		N7a	N6b	N2	N3	N9	VN04N1	09N1	N4	N5	N8	Flu B NAc	N10
N6		0.433
N2	1NN2	0.683	0.706
N3	4HZV	0.598	0.731	0.566
N9	7NN9	0.448	0.337	0.726	0.722
VN04N1	2HTY	0.823	0.787	0.910	0.765	0.536
09N1	3NSS	0.761	0.738	0.734	0.713	0.714	0.311
N4	2HTV	0.887	0.806	0.865	0.817	0.561	0.371	0.434
N5	3SAL	0.920	0.862	0.815	0.791	0.434	0.540	0.536	0.544
N8	2HT5	0.916	0.818	0.850	0.815	0.536	0.536	0.561	0.547	0.364
Flu B NA	1NSB	1.654	1.330	1.636	1.542	1.752	1.384	1.269	1.522	1.306	1.490
N10	4FVK	1.687	1.952	1.925	1.741	1.737	1.529	1.463	1.753	1.591	1.691	2.557
N11	4K3Y	1.686	1.572	1.544	1.479	1.408	1.586	1.471	1.359	1.602	1.390	2.161	0.903

^aN7 from strain A/mallard/ALB/196/1996 (H10N7).

^bN6 from strain A/Chicken/Nanchang/7-010/2000 (H3N6).

^cFlu B NA from strain B/Beijing/1/87.