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IRE sequences of wild strains and mutation strains. A: wild strain B: forth base point mutation(C→T) C: sixth base point mutation(C→T) D: forth base point mutation(C→T) and sixth base point mutation(C→T) E: forth base point mutation(C→T) and tenth base point mutation(C→T) F: first base point mutation(T→C), forth base point mutation(C→T) and seventh base point mutation(T→C).
