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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:carbon-12 atom
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Accession:CHEBI:36931 term browser browse the term
Definition:A carbon atom that has formula C.
Synonyms:related_synonym: (12)6C;   (12)C;   Formula=[12C];   InChI=1S/C/i1+0;   InChIKey=OKTJSMMVPCPJKN-IGMARMGPSA-N;   SMILES=[12C];   carbon-12

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 401
    chemical entity 401
      atom 401
        nonmetal atom 394
          carbon atom 381
            carbon-12 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 401
    subatomic particle 401
      composite particle 401
        hadron 401
          baryon 401
            nucleon 401
              atomic nucleus 401
                atom 401
                  main group element atom 394
                    p-block element atom 394
                      carbon group element atom 382
                        carbon atom 381
                          carbon-12 atom 0
paths to the root