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Fig. 7. Temperature profiles of antioxidant enzyme activities in Mya arenaria in vitro (units mg fresh mass). (A) Catalase in mantle tissues, (B) superoxide dismutase in gill tissues. Values are means ± S.D., N=5-8. **Values at 18 and 22 °C in B are significantly different from those at all other temperatures (P<0.01).