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(A) Histograms of methylation levels of genomic CpGs in wild-type oocyte, Dnmt3L−/− oocyte, sperm, blastocyst, and embryonic stem cell (ESC) genomes. (B) CpG methylation levels are plotted as a function of CpG density for the whole genome and 4 families of transposable elements (long interspersed nuclear element (LINE), short interspersed nuclear element (SINE), long terminal repeat (LTR), and DNA transposon).
