Fig. 2.

Comparison of the features of dark matter islands in archaeal thermophiles and mesophiles. a Distribution of the fraction of genome occupied by dark matter islands in mesophiles (M) and thermophiles (T). b Fraction of proteins containing low complexity segments, predicted transmembrane domains and predicted signal peptides in mesophiles (M) and thermophiles (T). c Fraction of different integrated elements in mesophiles (M) and thermophiles (T). The figure shows the data obtained with a non-redundant set of thermophile and mesophile genomes that included a single representative genome for each species, in order to eliminate biases potentially caused by the availability of genomes from multiple strains from some but not other species