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Alpha-diversity and beta-diversity of class 1 integron gene cassette (a to c, based on clone library data of class 1 integron gene cassettes; d to f, based on high-throughput sequencing data of class 1 integron gene cassettes) and class 3 integron gene cassette (g to i, based on class 3 integron gene cassettes derived from a clone library) profiles across wastewater treatment plants. Means ± SDs are shown. ANOVA was performed. *, P < 0.05; **, P < 0.01.
