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Small sample segment of the alignment spanning the start of the mutS gene (denoted in blue). Location of a mismatch is indicated by the integer '1' along the bottom row. Five columns contain SNDs: TTTCTT, AAAGAA, AAATAA, GGGAGG, and GAAAAA. The first four share the same bipartition pattern (111211) and are deemed equivalent, even though one of them results from a transversion. The other SND is considered distinct despite having the same mutation (A to G) found in the second SND.
