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Overrepresentation of a specific length of spacer in promoter sequences. Counts of a bipartite-type octamer with a spacer in all the promoters of the Arabidopsis genome are shown. The horizontal axis indicates the number of ‘n’s, i.e. the length of the spacer between the two tetramers. The two octamers shown (AACGnTCGT and ACGAnCGTT) are mutually complementary.
