Figure 1

Evolution of DNA sequences under the mutational pressure described by the "real BbTS". Light lines indicate the fractions of nucleotides in the sequence which initially has been composed of equal numbers of each nucleotide. Bold lines show the fractions of nucleotides in a sequence of nucleotide composition of the third positions in codons of the B. burgdorferi coding sequences from the leading strand. x-axis – the number of Monte Carlo Steps (MCS), y-axis – fraction of nucleotides in the evolving strand.