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The relative abundances (gene copies of antibiotic resistance genes (ARGs) normalized to the gene copies of 16S rRNA) of six tetracycline (TC) resistance genes (tetA, tetC, tetL, tetO, tetW, and tetX) and three sulfonamide resistance genes (sul1, sul2, and sul3), as well as the integrase gene of class 1 integrons (intI1) in different phases in system A and system B.
