English: Pictured in are adenine nucleotides A48 A85, and A99 (labeled with yellow carbons), as well as a positively charged magnesium ion (green). The planar isoalloxazine ring system of FMN (FMN depicted with green carbons) intercalates between A48, A85, and A99. The negatively charged phosphate group of FMN interacts with the positively charged magnesium ion, allowing this riboswitch to exhibit selectivity for FMN.
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