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The data set accompanying this document consists of eight human samples processed by Illumina MethylationEPIC  BeadChip arrays. The data set is taken from a study of DNA methylation in human pluripotent stem cells (hPCS) (Lee et al. Cell Rep 2017) and can be downloaded from Gene Expression Omnibus using the following accession number: GSE95531. To follow this tutorial, download the 16 .idat files associated with GSE95531 (note that two .idat files are generated for each array) and unzip them on your local computer.