RPKM expression values of 108 imprinted genes which also had copy number data (Additional file 2: Table S1) were downloaded from the CCLE legacy portal of the Broad Institute [45, 87]. Both legacy and most recent CCLE expression data are now available from the Cancer Dependency Map (DepMap) project site [45, 85, 86]. RNA sample library preparation using Illumina TruSeq RNA Sample Preparation protocol, RNA sequencing using Illumina HiSeq 2000 and HiSeq 2500, and initial data processing were previously described by the CCLE project [88].
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