Diversity of triplet recognition sequences. Coverage of the 64 possible triplet sequences based on the specificity of the extracted single finger–DNA subsites combinations. Each panel represents 16 different triplets, where the 5′ base is fixed (e.g., upper left is the ANN triplets). The height of the buttons at each position reflects that number of fingers that prefer this triplet within the data set, where those triplets without complementary fingers are white.