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DNA methylation was measured by the production of 5-methylcytosine (5-mC) in PBMCs isolated at (A) 1 d, (B) 3 d, (C) 10 d, and (D) 30 d after ITI exposure to 2.0 mg/rat of MMA-SS or GMA-MS welding fumes. Vehicle controls received saline. (n = 4–6; values are means ± standard error).
