Table 1.

EM data collection and processing

	PV1(M)–CD155-AP	PV1(M)
Underfocus, μm*	1.3 ∼ 2.1	1.3 ∼ 2.3
No. of micrographs	16	10
No. of particles†	1,156 (1,699)	1,081 (1,476)
Correlation coefficient‡	0.305 (0.040)	0.310 (0.032)
Resolution (Å)	22Å	22Å

^*Determined from the contrast transfer function of the microscope. 

^† The number of particles included in each three-dimensional map. The total number of boxed particles is given in parentheses. 

^‡ Averaged real space correlation coefficient (CC) and SD (in parentheses) for all particles, where cc = ∑(ρ₁ρ₂−<ρ₁><ρ₂>)/[∑(ρ₁²−<ρ₁>²)∑(ρ₂²−<ρ₂>²)], computed over all radii of the final model.