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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:protactinium molecular entity
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Accession:CHEBI:37303 term browser browse the term

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19795
    chemical entity 19795
      molecular entity 19794
        transition element molecular entity 16546
          f-block molecular entity 506
            actinoid molecular entity 0
              protactinium molecular entity 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19795
    subatomic particle 19794
      composite particle 19794
        hadron 19794
          baryon 19794
            nucleon 19794
              atomic nucleus 19794
                atom 19794
                  metal atom 17427
                    transition element atom 16842
                      f-block element atom 812
                        actinoid atom 320
                          protactinium atom 0
                            protactinium molecular entity 0
paths to the root