title: Biologically important isotope hybrid compounds in NMR:  1 H fourier transform NMR at unnatural abundance.
mesh_terms: D002734:Chlorophyll; D004578:Electron Spin Resonance Spectroscopy; D006859:Hydrogen; D007553:Isotope Labeling; D046911:Macromolecular Substances; D009682:Magnetic Resonance Spectroscopy; D011506:Proteins
chemical_list: D046911:Macromolecular Substances; D011506:Proteins; D002734:Chlorophyll; D006859:Hydrogen