title: Intermolecular nuclear shielding due to the aromatic amino acids of proteins and to porphyrins.
mesh_terms: D000596:Amino Acids; D055598:Chemical Phenomena; D002621:Chemistry; D006639:Histidine; D009682:Magnetic Resonance Spectroscopy; D011166:Porphyrins; D011506:Proteins; D011522:Protons; D014364:Tryptophan; D014443:Tyrosine
chemical_list: D000596:Amino Acids; D011166:Porphyrins; D011506:Proteins; D011522:Protons; D014443:Tyrosine; D006639:Histidine; D014364:Tryptophan