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. 2000 Jul 18;97(15):8403–8408. doi: 10.1073/pnas.97.15.8403

Figure 3.

Figure 3

Point mutational spectra of heart and small intestine at young and old age. Bars indicate the frequency of each type of point mutation as indicated. The black areas in the G:C to A:T bars indicate the fraction of such mutations that had occurred at CpG sites.