Organochlorines include DDT, Aldrin, Dieldrin and BHC. There are some reported cases of workers who developed anemia after multiple dieldrin exposures. Mallard carcasses found to have higher levels of Dieldrin. Dieldrin is closely related to aldrin, which reacts further to form dieldrin. Endrin is a stereoisomer of dieldrin. Immunological tests linked an antigenic response to erythrocytes coated with dieldrin in those cases. The chemicals dieldrin and aldrin were widely applied in agricultural areas throughout the world. The toxic substances included PCBs, dioxins, two chlorinated pesticides, DDE, dieldrin and PBDEs. Most of the animal studies done with aldrin and dieldrin used rats. These include&colon; aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex and toxaphene. The accumulated levels of Dieldrin in the body were believed to lead to convulsions. These included aldrin, dieldrin, chlordane, heptachlor, texaphene, and mirex. The toxicity of aldrin and dieldrin is determined by the results of several animal studies. Insecticides like dieldrin and endrin have been shown to persist for decades in the environment. Most POPs (including dieldrin) bioaccumulate in the fatty tissues of humans and other animals.