Fig. 3.

Genome organization of selected nidoviruses. The genomic ORFs of viruses representing major lineages of nidoviruses are indicated and the names of the replicase and main virion genes are given. References to the nomenclature of accessory genes can be found in the text. Genomes of large and small nidoviruses are drawn to different scales. This figure was updated from Fig. 39.2 presented in Siddell et al. (2005).