Isotopic studies of the biosynthesis of nucleic acid components; purines and pyrimidines.
D009696:Nucleic Acids; D011687:Purines; D011743:Pyrimidines
D009696:Nucleic Acids; D011687:Purines; D011743:Pyrimidines; C030985:purine
NUCLEINS; PURINE AND PURINE BASES; PYRIMIDINES