摘要 : The crystal structure of the vaccinia virus D13 protein presented by Bahar et al. in this issue of Structure displays fused ‘‘virus jelly roll’’ folds, ubiquitous among dsDNA icosahedral viruses. Although D13 is not present in the... 展开 The crystal structure of the vaccinia virus D13 protein presented by Bahar et al. in this issue of Structure displays fused ‘‘virus jelly roll’’ folds, ubiquitous among dsDNA icosahedral viruses. Although D13 is not present in the mature virus, its structure suggests its evolutionary descent from an ancient icosahedral ancestor. 收起