Table 2. Occurrence of proposed dimeric arrangements in NS1 ED structures solved to date.

Strain	Spacegroup	PDB ID	Monomers in asymmetric unit	Helix-Helix	Strand-Strand
PR8	P4322	2GX9	2	4	4
PR8	P64	3O9U*	8	4	4
PR8	P212121	3O9S*	2	4	8
PR8	C2221	3O9T*	2	4	8
Alb/76	P6522	3D6R	2	4	8
Alb/76	P61	3OA9*	2	4	8
Ud/72	C2221	3EE8	2	4	8
Ud/72	P212121	3EE9	2	4	8
Cal/09	P21	3M5R	6	4	8

New crystal structures reported here are marked with an asterisk.