Fig. 6From: Effects of copper and cadmium on development and superoxide dismutase levels in horseshoe crab (Limulus polyphemus) embryosEnzymatic activity of SOD’s (mean ± SE) in Stage 20 Limulus polyphemus embryos exposed to Cu. a 4 h, b 8 h, c 16 h, and d 24 h acute exposure to CuBack to article page