The heterocyclic pyrimidine and purine compounds which are constituents of all nucleic acids. Adenine (A
), guanine (G
) and cytosine (C
) are found in both DNA and RNA, thymine (T
) is found (primarily) in DNA and uracil (U
) only in RNA.
PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 147 (https://doi.org/10.1351/pac199264010143)