G-quadruplex forming sequences in the genome of all known human viruses: A comprehensive guide
Fig 2
Box and whisker plots of PQSs in different virus classes.
Each panel refers to the indicated type of G-island (GG, GGG, GGGG). The abundance of PQSs per 1 kb of viral genome is reported in the y-axis (for each viral species, the median value among all available strains is used) and the different virus categories in the x-axis. Boxplots are delimited by the first and third quartile and the straight and dotted lines drawn inside are the median and mean values, respectively, of the PQS distribution. The single observations are reported as dots close to the box plot. Whiskers delimit all the points that fall above/below the third/first quartile plus/minus 1.5 times the interquartile range (IQR). Orange and blue box plots refer to positive and negative strand respectively.