Use this function To retrieve a list of Reactome ReferenceEntity associated to your supplied Cross Reference (i.e. External) ID.

rba_reactome_xref(xref_id, ...)



molecule's cross-reference (external) identifier.


rbioapi option(s). See rba_options's arguments manual for more information on available options.


List containing the ReferenceEntity corresponding to your supplied cross-reference (external) ID.


Reactome cross-references external database's identifiers to it's database Entries named ReferenceEntity, which resembles the invariant aspect of a molecule. Thus there is a one-to-many relationship between Reactome's ReferenceEntity object and the molecule's ID in external databases, which in Reactome's terms is called Cross Reference.
See rba_reactome_participants's "Details section" to learn more about how Reactome classifies molecules.

Corresponding API Resources



  • Jassal B, Matthews L, Viteri G, Gong C, Lorente P, Fabregat A, Sidiropoulos K, Cook J, Gillespie M, Haw R, Loney F, May B, Milacic M, Rothfels K, Sevilla C, Shamovsky V, Shorser S, Varusai T, Weiser J, Wu G, Stein L, Hermjakob H, D'Eustachio P. The reactome pathway knowledgebase. Nucleic Acids Res. 2020 Jan 8;48(D1):D498-D503. doi: 10.1093/nar/gkz1031. PubMed PMID: 31691815.

  • Reactome Content Services API Documentation


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