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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:30224 term browser browse the term
Definition:Atom-like pair of particles consisting of an anti-electron (positron) and an electron.
Synonyms:related_synonym: Ps;   e(+)e(-)

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 20059
    subatomic particle 20056
      fundamental particle 20056
        lepton 20056
          electron 20056
            positronium 0
              ortho-positronium 0
              para-positronium 0
paths to the root