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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:down quark
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Accession:CHEBI:36367 term browser browse the term
Definition:A first-generation quark with a charge of -1/3. The up and down quarks are the fundamental constituents of the nucleons.
Synonyms:related_synonym: d;   d-quark

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  CHEBI ontology 19911
    subatomic particle 19909
      fermion 19909
        quark 0
          down quark 0
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