Table 2. Unique and common PTMs identified on viral RNAs isolated from virions. Dark color blocks show PTMs common to all ss(+) RNA viruses, and light color blocks highlight unique modifications on each respective viral RNA. The table does not show the unique and common PTMs on the viral RNA isolated from cell lysates, nor the abundance of each PTM. Comprehensive abundance data are reported separately in Supplementary Table S9. Full PTM names are listed in Supplementary Table S3.