Heavy Metal-Induced Oxidative DNA Damage in Earthworms: A Review

Figure 2

Experimental design. Metals (0, 0.5, or 10 mg as Cd or Ni) were added to 50 g soil in a 600 mL glass container. After 0-, 1-, 2-, 3-week, and 3 month exposures, E. fetida were cut into four rough segments (S1–S4). S1: head region, S2: anterior body region, S3: posterior body region, S4: tail region.