6WJR:
reference: FMN riboswitch aptamer symmetry facilitates conformational switching through mutually exclusive coaxial stacking configurations., Wilt HM, Yu P, Tan K, Wang YX, Stagno JR, J Struct Biol X. 2020 Aug 6;4:100035. doi: 10.1016/j.yjsbx.2020.100035., eCollection 2020. PMID: 33103111

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