Add to ORKGIlluminaHumanMethylation27kACCNUM is an R object that contains mappings between a manu-facturer’s identifiers and manufacturers accessions. Details For chip packages such as this, the ACCNUM mapping comes directly from the manufacturer. This is different from other mappings which are mapped onto the probes via an Entrez Gene identifier. Each manufacturer identifier maps to a vector containing a GenBank accession number