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DNA methylation of Mup promoter in F4 P line and M line males. Open and filled circles represent unmethylated and methylated CpG dinucleotides, respectively. Promiscuous-line males had significantly less methylation at site 4, a putative binding site for USF1 (furthest right); P < 0.05 Fisher’s exact test. n = 8 individuals, 66 sequences.
