CpG

CpG is a stratification module for VariantEval. It is a three-state stratification:

• The locus is a CpG site ("CpG")
• The locus is not a CpG site ("non_CpG")
• The locus is either a CpG or not a CpG site ("all")

A CpG site is defined as a site where the reference base at a locus is a C and the adjacent reference base in the 3' direction is a G.