CpG methylation in the erythropoietin promoter from −306 to −275.

DNA from Hep3B and HeLa cells was modified by bisulfite conversion. Converted DNA was amplified, and polymerase chain reaction products were sequenced. Coding strand: sequence from the complementary strand (guanines are converted to adenines). Noncoding strand: sequence from the original strand (cytosines converted to thymines). (open circles) Methylated CpGs.