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The methylation status of the cytosines located on the 5 region of the pS2 gene have been investigated in two human breast cancer cell lines. The genomic sequencing method used is based on an oxydative deamination by NaHSO 3 of the unmethylated cytosines, but not 5-methylcytosine. Data obtained indicate that in the DNA extracted from the pS2-expressing cell line, MCF7, the CpG located...