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spxA2 and saiR reside within a five-gene operon in B. anthracis. spxA2 and saiR are likely transcribed from the spxA2 promoter together with three other genes shown using Ames nomenclature. The function of these three genes is unknown. The bent arrow marked with P indicates the operon promoter and the direction of transcription, and the lollipop indicates a putative ρ-independent transcription terminator.
