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(A) Enrichment (relative to global CpG enrichment) of human G4s within 1000 bp of Horvath and Levine ageing clocks sites including enrichment from G4-seq data, as well as cell-based BG4-ChIP experiments in NHEK, HaCaT, and K562 cells. (B) Statistical significance of G4 enrichment within 1000 bp of Horvath and Levine ageing clocks found with G4-seq data and in NHEK, HaCaT, and K562 cells.
