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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:22695 term browser browse the term
Definition:A molecular entity having an available pair of electrons capable of forming a covalent bond with a hydron (Bronsted base) or with the vacant orbital of some other molecular entity (Lewis base).
Synonyms:related_synonym: Base1;   Base2;   Basen;   Nucleobase;   bases
 xref: KEGG:C00701

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Path 1
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  CHEBI ontology 19785
    role 19732
      chemical role 19248
        base 16946
          Bronsted base + 16945
          Lewis base + 16939
          piperidine + 100
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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.