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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:46653 term browser browse the term
Definition:The triplet state of positronium with electron and positron having parallel spins (S=1).
Synonyms:related_synonym: o-Ps;   orthopositronium

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  CHEBI ontology 20056
    subatomic particle 20054
      fundamental particle 20054
        lepton 20054
          electron 20054
            positronium 0
              ortho-positronium 0
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