DNA methylation data from whole blood samples were assessed using an Infinium MethylationEPIC BeadChip microarray (Illumina Inc., San Diego, California) according to the manufacturer’s protocol for the discovery, first, and second replication cohorts (NIAAA and GS). The third replication sample (GTP) and neural tissues from both postmortem cohorts were assessed with the Illumina 450K chip as described previously [37 (link), 38 (link)]. Pre-processing of the GS data has been described in detail elsewhere [39 (link)].
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