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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.

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Accession:CHEBI:36346 term browser browse the term
Definition:Quarks comprise one of two classes of the fundamental particles. Quarks possess fractional electric charges and are not observed in free state. The word 'quark' first appears in James Joyce's Finnegans Wake and has been chosen by Murray Gell-Mann as a name for fundamental building blocks of particles.
Synonyms:related_synonym: quarks

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  CHEBI ontology 22094
    subatomic particle 22086
      fermion 22086
        quark 0
          bottom quark 0
          charm quark 0
          down quark 0
          strange quark 0
          top quark 0
          up quark 0
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