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The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at The data is made available under the Creative Commons License (CC BY 3.0, For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.

Term:nitrogen-13 atom
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Accession:CHEBI:36935 term browser browse the term
Definition:The radioactive isotope of nitrogen with relative atomic mass 13.0057386. The longest-lived nitrogen radionuclide with half-life of 9.965 min.
Synonyms:related_synonym: (13)7N;   (13)N;   Formula=N;   nitrogen, isotope of mass 13;   nitrogen-13
 xref: CAS:13981-22-1

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Path 1
Term Annotations click to browse term
  CHEBI ontology 916
    chemical entity 916
      atom 901
        nonmetal atom 860
          nitrogen atom 342
            nitrogen-13 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 916
    subatomic particle 901
      composite particle 901
        hadron 901
          baryon 901
            nucleon 901
              atomic nucleus 901
                atom 901
                  main group element atom 870
                    p-block element atom 867
                      pnictogen 356
                        nitrogen atom 342
                          nitrogen-13 atom 0
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