“…Current beings induced by low doses of heavy metals and organic pollutants, mainly in aquatic systems and in human diseases [6,[9][10][11][12][13]. For example, Jelaso et al [9] reported that exposure of developing Xenopus laevis tadpoles to low levels of PCB mixture A1254 (5-50 ppb) significantly increased expression of six genes such as p53 nerve growth factor (NGF), proopiomelanocortin, interleukin-1 converting enzyme, -actin and glycerol-dehydes3-phosphate dehydrogenase independent of any health effects.…”