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Length distribution of viral representative proteins from UniProtKB. Total number of UniProtKB viral proteins according to their length. The list includes only full-length proteins. The x-axis values indicate the range (240 are proteins with a length of 120–240 amino acids). In blue, the fraction of viral proteins analyzed in this study. Dark blue and dark pink indicate proteins marked as ‘uncharacterized’. This fraction is maximal for short proteins <120 in length.
