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Spectrum of nucleotide substitutions in the HCC1954 and HCC1954BL genomes. Frequency of point mutations in each of the six possible nucleotide substitution classes (A > C|T > G, A > G|T > C, A > T|T > A, G > A|C > T, G > C|C > G, G > T|C > A) observed in the HCC1954 (blue) and HCC1954BL (orange) genomes.
