שאלה | Relative to all methylation sites, there was a significant enrichment of "clock sites" in regions which were previously annotated as CpG islands and as promoters. Why do you think both types of sites were identified as enriched?

Relative to all methylation sites, there was a significant enrichment of "clock sites" in regions which were previously annotated as CpG islands and as promoters. Why do you think both types of sites were identified as enriched?

		Since CpG islands are important for repression and promoters for gene expression.
		Since CpG islands have relatively more CpG sites in them and promoters are more accessible.
		Since CpG islands are associated with repetitive sequences and promoters are not.
		Since CpG islands and promoters oftentimes overlap.