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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:positronium molecular entity
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Accession:CHEBI:46619 term browser browse the term
Definition:A type of exotic molecular entity in which an electron and a positron are bound together as a long-lived metastable state.
Synonyms:related_synonym: positronium molecular entities

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  CHEBI ontology 19831
    chemical entity 19829
      molecular entity 19829
        exotic molecular entity 0
          positronium molecular entity 0
            dipositronium 0
            positronium + 0
            positronium hydride + 0
            positronium(1-) 0
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