title: Charge-transfer complexes in biological systems.
mesh_terms: D000042:Absorption; D000596:Amino Acids; D055598:Chemical Phenomena; D002621:Chemistry; D004735:Energy Transfer; D004798:Enzymes / Q000032:analysis; D008956:Models, Chemical; D009243:NAD / Q000032:analysis*; D009536:Niacinamide / Q000032:analysis; D011726:Pyridinium Compounds / Q000032:analysis*; D013053:Spectrophotometry; D013057:Spectrum Analysis
chemical_list: D000596:Amino Acids; D004798:Enzymes; D011726:Pyridinium Compounds; D009243:NAD; D009536:Niacinamide