title: Fluorescence energy transfer as a spectroscopic ruler.
mesh_terms: D004735:Energy Transfer; D004798:Enzymes; D005453:Fluorescence; D008722:Methods; D008954:Models, Biological; D009690:Nucleic Acid Conformation; D011487:Protein Conformation; D011506:Proteins; D012343:RNA, Transfer; D011955:Receptors, Drug / Q000378:metabolism; D012243:Rhodopsin / Q000378:metabolism; D013045:Species Specificity
chemical_list: D004798:Enzymes; D011506:Proteins; D011955:Receptors, Drug; D012243:Rhodopsin; D012343:RNA, Transfer