Fig. 2. Concentration of thiobarbituric acid reactive substances (TBARS) during the transition from 20 day estivation (time zero) to 24 h active snails H. aspersa. Values are means ± S.E.M. (N=3-4 for hepatopancreas; N=3 for foot muscle). ^aSignificantly different from the corresponding value from estivating snails, P<0.01; ^bP<0.05; ^csignificantly different from the corresponding values for 5 min and 24 h active snails, P<0.05.