Contribution of alpha-dimer asymmetry and optimal growth temperature (OGT) to GC content variation. This dataset contains 10 thermophilic bacteria of three different phyla (five from Firmicutes, two from Actinobacteria, and three from Thermotogae), which have a broad GC content (from 31% to 71%) and OGT (from 55°C to 80°C) variation. The solid circles denote bacteria of the dnaE3|polV group, with two exceptions (one, labeled in blue, which lost polC, and the other, labeled in red, has an insertion of dnaE2). The red squares denote bacteria of the dnaE1|dnaE2 group. The phylogenetic tree was constructed using the NJ method of MEGA 4.0 by using 16s rRNA sequences. Bootstrap values (>50) are labeled.