[i] Category I SNPs include SNPs whose ASM is not based solely on SNP-containing CpG sites. However, many category I SNP regions still have SNP-containing CpG nucleotides. Category II SNPs include SNPs whose ASM is completely dependent on the presence of a SNP-containing CpG dinucleotide. Category III SNPs (data not shown) do not show ASM. The category I and category II percentages represent the number of SNPs in the respective category divided by the total number of heterozygous SNP calls in each cell line.