EMBL-EBI resources
The European Bioinformatics Institute (EMBL-EBI) Platform aims to bring together the efforts of a number of EMBL-EBI resources that provide access to their data using Semantic Web technologies. It provides a unified way to query across resources using the W3C SPARQL query language.
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Query connecting Ensembl with UniProt endpoint
biology Ensembl protein UniProt

Get protein information from UniProt that Ensembl has associated with ENSG00000139618 via a federated query