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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:30399 term browser browse the term
Definition:A nickel cation that has formula Ni.
Synonyms:exact_synonym: nickel(1+) ion;   nickel(I) cation
 related_synonym: Formula=Ni;   InChI=1S/Ni/q+1;   InChIKey=YWMAPNNZOCSAPF-UHFFFAOYSA-N;   Ni;   Nickel cation;   Nickel, ion (Ni1+);   SMILES=[Ni+]
 xref: CAS:14903-34-5;   Gmelin:15198

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 401
    role 401
      biological role 401
        biochemical role 360
          cofactor 26
            nickel cation 0
              nickel(1+) 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 401
    chemical entity 401
      molecular entity 401
        elemental molecular entity 21
          monoatomic entity 15
            monoatomic ion 15
              monoatomic cation 10
                metal cation 10
                  transition element cation 0
                    nickel cation 0
                      nickel(1+) 0
paths to the root