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Fig. 1. Superoxide dismutase (SOD) activity in Z. viviparus liver samples after 2 h of exposure to 18°, 22° and 26°C and after 24 h recovery (recov.) from the respective temperature. Enzyme activity was measured at 20°C. Values are means ± s.d., N=3-5; *significantly different from the unstressed group, P<0.05.