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Effect of low doses of procaine (P-5: 10-5, P3x-5: 3 × 10-5, P-4: 10-4 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 EL(-), †P < 0.05, compared with the procaine 10-5 M (P-5) group.
