Fig. 3. Cellular damage in response to experimental hyperoxia. (A) Carbonyl and (B) MDA contents were measured in the three compartments of A. viridis (Ec, ectoderm; Ed, endoderm; FIZ, freshly isolated zooxanthellae) during the daytime. (C) Carbonyls and (D) MDA content were also measured in A. schmidti total extract during the daytime, for control (C) and hyperoxia-treated specimens (H). Cytosolic fractions containing a quantity of 100 and 150 µg of protein were analyzed for carbonyl and MDA content, respectively. Data are presented as means ± S.E.M. of four independent analyses. ^*Indicates significant differences between control and stressed specimens (Student's t-test P<0.05).