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at the enhancers that control those genes (see Figure "A nucleosome with histone tails set for transcriptional activation"). Biopsies of the vastus lateralis muscle showed expression of 13,108 genes at baseline before an exercise training program. Six sedentary 23-year-old Caucasian males provided vastus lateralis biopsies before entering an exercise program (six weeks of 60-minute sessions of riding a stationary cycle, five days per week). Four days after the exercise program was completed, biopsies of the same muscles had altered gene expression,

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