English: Schematic diagrams of the genome structure of the representative viruses in the four genera of the family Closteroviridae. LIYV, Lettuce infectious yellows virus, genus Crinivirus; BYV, Beet yellows virus, genus Closterovirus; GLRaV-3, Grapevine leafroll-associated virus 3, genus Ampelovirus; GLRaV-7, Grapevine leafroll-associated virus 7, genus Velarivirus. ORFs are shown as boxes, with the related domains indicated in the same in-fill. PRO, papain-like cysteine proteinase; MTR, methyltransferase; HEL, helicase; POL, RNA-dependent RNA polymerase; HSP70h, heat shock protein 70 homolog; CP, capsid protein; CPm, minor capsid protein; P, proteins named by their approximate molecular mass (e.g., P34, 34-kDa protein). The functional roles of some of the protein products are indicated with the well-studied LIYV and BYV. Genome size is labeled on the right side.