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P53 mediates several biological processes for preservation of genetic stability such as the induction of cell cycle arrest, DNA repair or apoptosis in response to DNA damage. The antiparasitic drug, 1-(2-hydroxyethyl)-2-methyl-5-nitroimidazole (metronidazole, MTZ) is able to increase lymphocyte proliferation inducing at the same time chromosomal aberrations. Trying to understand this unexpected event...