desi mallu twitter|Resmi R Nair (@resmirnair : Tuguegarao The latest tweets from @sree_casanova Two categories have been identified, those capable of causing DNA damage and mutations directly (genotoxic, or direct-acting, carcinogens) and those that require prior metabolic activation by cells of the host to be converted to mutagens (epigenic, or indirect-acting, carcinogens). In the industrial countries much progress has been made in .

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