Referring to any organic compound forming a ring made up of carbon atoms and at least one atom other than carbon. Examples of heterocyclic amino acids are proline, hydroxyproline, tryptophan, and histidine (see amino acid). Purines and pyrimidines are heterocyclic compounds (see bases of nucleic acids). The porphyrin portion of heme is made up of heterocyclic rings (see heme).
Subjects: Genetics and Genomics — Chemistry.