title: Ancient, giant riboswitches at atomic resolution.
authors.forename: Ronald R
authors.initials: RR
authors.lastname: Breaker
mesh_terms: D003038:Cobamides / Q000737:chemistry*; D015964:Gene Expression Regulation, Bacterial / Q000235:genetics*; D056546:Lactobacillales / Q000201:enzymology*; D008958:Models, Molecular; D011487:Protein Conformation; D058928:Riboswitch / Q000235:genetics*
chemical_list: D003038:Cobamides; D058928:Riboswitch