Animal 12 Phosphorus Isotopes animal 12 article 12 phosphorus 12 enzymology 10 Adenine Nucleotides 8 Cytosine Nucleotides 8 Diphosphates 8 Enzyme Activation 8 Glucosyltransferases 8 Guanine Nucleotides 8 Muscles 8 Phosphoric Monoester Hydrolases 8 Rabbits 8 Uracil Nucleotides 8 adenine nucleotide 8 enzyme activation 8 glucosyltransferase 8 guanine nucleotide 8 muscle 8 phosphatase 8 pyrimidine nucleotide 8 pyrophosphate 8 rabbit 8 Kinetics 6 kinetics 6 Adenosine Triphosphate 4 Caffeine 4 Chemistry 4