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. Author manuscript; available in PMC: 2009 Jul 20.
Published in final edited form as: Nature. 2007 Aug 22;449(7159):248–251. doi: 10.1038/nature06146

Figure 4. Periodicity of CpG sites in maternally imprinted DMRs17.

Figure 4

a, Frequencies of CpG pairs at a given distance with respect to all pairs, for 11 maternally imprinted DMRs. The slope of the graph in the inset is 9.5. b, The autocorrelation of peaks for 11 maternally imprinted DMRs. One sequence (Impact) was excluded from the plot because it contains repeats (see d), with each CpG site separated from the second subsequent one by ten base pairs; thus, it follows the same pattern seen by the other 11 DMRs, bringing the total number to 12 DMRs. c, Autocorrelation of peaks for ten CpG islands randomly selected from human chromosome 21. d, A region of DMR sequences of the U2af1-rs1 and Impact genes17.