Fig. 2.

The HK97 lineage. Shown is a gallery of HK97-like capsid protein structures determined by using crystallography for HK97 gp5 and T4 gp24 or cryo-EM for ϕ29 gp5, ε15 gp7, P22 gp5, herpes simplex virus type 1 (HSV-1) VP5, P-SSP7 gp10, T7 gp10, and λ gpE. (The HK97, T4, and HSV-1 images were adapted from reference 33 by permission from Macmillan Publishers Ltd.; the ϕ29 image was adapted from reference 60 with permission of the publisher; the ε15 image was adapted from reference 32 with permission from Macmillan Publishers Ltd.; the P22 image was adapted from reference 16 with permission of the publisher; the P-SSP7 image was adapted from reference 53 with permission of Macmillan Publishers Ltd.; the T7 image was adapted from reference 1 with permission of the publisher; and the λ image was adapted from reference 46 with permission of the publisher.)