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Fig. 4. Diel cycle of superoxide dismutase (SOD) enzyme activities from animal
tissue and symbiotic zooxanthellae collected at the 5-m depth in Eilat, Red
Sea. Measurements were performed between 3 and 5 March 2002. Activity is
presented as % activity [(U mg-1 protein)/(max U mg-1
protein)] for (A) F. favus (N=3), (B) G. lobata
(N=2) and (C) P. sinuosa (N=3). The black bars
represent SOD activity of the animal tissue and the gray bars represent SOD
activity of the zooxanthellae. Values are represented as means ± s.d.
(night=05.00 h; morning=08.00 h; mid.=10.00-14.00 h; afternoon= 16.00 h).