The relative length of sequences of known or predicted function and unknown function.

<p>Sequences of known or predicted function include ORFs and transcriptional regulatory sequences. Sequences of unknown function include 5’- and 3’-UTRs within transcriptional units and IGRs between transcriptional units. Genomic leader sequences (up to the N gene TI sequence) and trailer sequences (beyond the L gene TTP sequence) were excluded from the analysis as the extreme terminal sequences of some viruses were not determined. The sequence lengths are provided for each virus in the data set but identified only by their genus assignment.