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. 2017 Feb 22;19(2):324–331. doi: 10.22074/cellj.2016.3857

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Fig.3 — Comparison of 8-hydroxydeoxyguanosine (8-OHdG) levels in the lung tissues of rats from different experimental groups. Error bars indicate the SD of the mean for n=7 independent experiments. Melatonin significantly decreased the level of 8-OHdG by 37% in the intraperitoneal (IP) group and 34% in the oral administration group (P<0.0005). The IP injection of melatonin more efficiently reduced 8-OHdG levels compared to the oral administration group (P=0.045).