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Definition of repeats. (a) Exact repeats, labeled as A1 and A2. (b,c) Merging repeats. (b) Merging with gaps; (c) merging with overlap. The nucleotide sequence is shown as a purple bar. Top, red, blue and yellow lines show the locations of the repeat sequences. Pairs A1 and A2, B1 and B2, and C1 and C2 are initial repeat pairs. Bottom, green bars labeled M1, M2, M3 and M4 indicate the location of merging repeats.
