Interspecies comparison of non-STR ePCR fragment length differences. (A) A scatterplot comparing the number of nucleotides outside of STR regions that are present in either the human or chimpanzee ePCR fragment but not both. Symbols and colors follow Figure 3. For microsatellite NA.D12S.2 the distribution of alleles in humans (blue) and in chimpanzees (red) are shown for (B) PCR fragment lengths and (C) repeat numbers. The blue and red vertical lines indicate the mean length in humans and chimpanzees, respectively.