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Combinations of palindromes generated by different approaches. Pink dots, selection by negative Pearson correlation; green, selection by F-test; blue, all combinations by 5 from 14 palindromes with 14 di-nucleotides used, red, combinations from literature:1, Harkey et al. [14], 2, Bystrykh et al. [21], 3, Biasco et al. [20], 4, Gabriel et al. [15], which is identical to simplified Wang et al. [16]. Details in a Additional file 1: Table S1.
