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Effect of high doses of procaine (P3x-4: 3 × 10-4, P-3: 10-3, P3x-3: 3 × 10-3 M) on the reactive oxygen species (ROS) attack. Data are presented as mean ± SE. ACh: acetylcholine, EL(-): before electrolysis. †P < 0.05, compared with ACh 10-7 to 10-6 M of the procaine 10-5 M (P-5) group.
