6q57 A 89 2.72 RF01831 URS000080DF21_210007 0046653 210007 ggagaguagaugauucgcguuaagugugugugaaugggaugucgucacacaacgaagcgagagcgcggugaaucauugcauccgcucca <<<<....<<<<<<<<<<<<....<<<<<<<<<.<.(((((..>>>>>>>>.>>..<<....>>>>>.>>>>>>>>>.))))).>>>>. ((((....((((((((((((......(((((((...[[[[[...))))))).....((....))))).))))))))).]]]]].)))). X-ray crystal structure of the tetrahydrofolate riboswitch aptamer bound to 5-deazatetrahydropterin; tetrahydrofolate riboswitch aptamer