ID2 and schizophrenia: The results also show that schizophrenia-associated DNA methylation in iPS cells is not shared by adult cells (ONS cells and fibroblasts) from the same individuals, except for five gene loci that were differentially methylated in all three cell types in patient cells compared to control cells: four hypomethylated genes (PSMD5, AEN, FAM20B, LRRN4) and one hypermethylated gene (ID2).