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SOD activity in peripheral organs during cocaine (coc) self-administration (SA) by yoked-triad procedure. Data are shown as mean ± SEM; ***p < 0.001 versus yoked saline (sal). In control (yoked saline) rats, the absolute SOD activity was 3.5 ± 0.09 U/mg protein in the liver, 7.3 ± 0.19 U/mg protein in kidney and 6.4 ± 0.52 U/mg protein in the heart. N = 6–8 rats/group
