Identification of CpG island only in promoter and exon 1 regions of EndoG gene among all known human cell death endonucleases including sequence variants. The criteria for CpG island identification were: length > 500bp, GC > 55%, observed/expected ratio > 0.65). DNase 1 (GenBank accession # NM 005223.3), DNase 1L1 variants 1 (NM 006730.2), 2 (NM 001009932.1), 3 (NM 001009933.1) and 4 (NM 001009934.1), DNase 1L2 (NM 001374.2), DNase 1L3 (DNase γ) (NM 004944.2), DNase 2α (NM 001375.2), DNase 2β variants 1 (NM 021233.2) and 2 (NM 058248.1), L-DNase II (LEI) (NM 030666.2), caspase-activated DNase (CAD) (NM 004402.2) and EndoG (NM 004435.2). CpG island in EndoG promoter/exon 1 is shown in solid black color.