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DNA methylation at the CSF-1 transcription start site. Twenty-one cleavage fragments containing 35 out of a total of 58 CpG sites in this region could be analyzed. The pair of cleavage fragments containing CpG sites 15-18 and 45-47 could not be distinguished from each other in the analysis. Therefore, the proportion of methylation in each of these fragment groups is represented as an average value.
