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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:46652 term browser browse the term
Definition:The singlet state of positronium with electron and positron having antiparallel spins (S=0).
Synonyms:related_synonym: p-Ps;   parapositronium

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  CHEBI ontology 19911
    subatomic particle 19909
      fundamental particle 19909
        lepton 19909
          electron 19909
            positronium 0
              para-positronium 0
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