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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:49547 term browser browse the term
Definition:A caesium ion that has formula 132.90545.
Synonyms:related_synonym: CESIUM ION;   Cs;   Formula=Cs;   InChI=1S/Cs/q+1;   InChIKey=NCMHKCKGHRPLCM-UHFFFAOYSA-N;   SMILES=[Cs+];   caesium;   cesium cation;   cesium(1+)
 alt_id: CHEBI:33126;   CHEBI:49546
 xref: CAS:18459-37-5;   Gmelin:15188;   PDBeChem:CS

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19787
    chemical entity 19787
      molecular entity 19784
        inorganic molecular entity 19456
          inorganic ion 15692
            caesium ion 0
              caesium(1+) 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19787
    subatomic particle 19784
      composite particle 19784
        hadron 19784
          baryon 19784
            nucleon 19784
              atomic nucleus 19784
                atom 19784
                  main group element atom 19672
                    main group molecular entity 19672
                      s-block molecular entity 19430
                        alkali metal molecular entity 10546
                          caesium molecular entity 2
                            caesium ion 0
                              caesium(1+) 0
paths to the root


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