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Polymorphism of AAC(6′)-Ib and the relative abundance of representative types in various ecological niches. (a) Shannon entropy at 133 amino acid residues of AAC(6′)-Ib among the entire sequences obtained from all samples. (b) Heatmap of the degree of polymorphism at 133 amino acid residues of AAC(6′)-Ib in each sample. (c) Major types of AAC(6′)-Ib and their relative abundance in each sample. Others (black) indicate sequences that were not assigned to the seven major types.
