“…They exert Due to their stability and lipophilic character, PCBs persist in the environment and accumulate in fatty tissues of animals and humans (Kimbrough, 1995;Hansen, 1999). PCBs are well known as potential neurotoxic (Seegal et al, 2005), teratogenic, and embriotoxic agents, effecting the embryonic development in fish (Arzuaga et al, 2004), birds (Hoffman et al, 1996;Summer et al, 1996), rodents (Goodwill et al, 2007; Kimura- Kuroda et al, 2007) and humans (Pocar et al, 2006;Roegge and Schantz 2006). PCBs can also contribute to the development of cancer in experimental animals (Carpenter, 2006;Knerr and Schrenk, 2006;Lehmann et al, 2007) and are classified as the probable carcinogens in humans (class 2A carcinogens according to the IARC classification) (Shields, 2006).…”