500 ng of genomic DNA from each sample was treated with sodium bisulfite in duplicate, using the EZ96 DNA methylation kit (Zymo Research, CA, USA) following the manufacturer’s standard protocol. Genome-wide DNA methylation was assessed using the Illumina Infinium HumanMethylation450 BeadChip (Illumina Inc, CA, USA) according to manufacturer’s instructions. Illumina GenomeStudio software was used to extract the raw signal intensities of each probe (without background correction or normalization).
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