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In this experlment,the relation between mutagenesis and SOSresponse of 2,5-dichloronitrobenzol (2,5-DCNB),a new man-madeagricultural enhancer to nitrogenous fertilizer,and theirmechanism have been studied in S.typhimurium TA1535,TA1535/pKM101 (1.e TA100),