Sequence gene information from GeneBank and Pubmed databases (Federated Query)

Endpoints: 
Query: 
Select distinct ?label ?Title ?Length ?genecode ?Article ?last_name ?fore_name ?article_title where{ {SERVICE <$endpoint-1$> { ?s<http://www.w3.org/1999/02/22-rdf-syntax-ns#type><http://bio2rdf.org/genbank#Sequence> . ?s<http://www.w3.org/2000/01/rdf-schema#label>?label . ?s<http://bio2rdf.org/bio2rdf#lsid>?genecode . ?s<http://purl.org/dc/elements/1.1/title>?Title . ?s<http://bio2rdf.org/bibtex#Article>?Article . ?s<http://bio2rdf.org/bio2rdf#length>?Length . ?label bif:contains "'??gene'" . } } { SERVICE <$endpoint-2$> { ?Article<http://www.w3.org/1999/02/22-rdf-syntax-ns#type><http://bio2rdf.org/pubmed_vocabulary:PubMedRecord> . ?Article<http://bio2rdf.org/pubmed_vocabulary:author> ?author . ?Article<http://purl.org/dc/terms/title>?article_title . ?author<http://bio2rdf.org/pubmed_vocabulary:last_name> ?last_name . ?author<http://bio2rdf.org/pubmed_vocabulary:fore_name> ?fore_name . } } } Limit ??number
Statement: 

Display information on a sequence gene $gene$ (e.g. p53)
Limit of result $number$ (e.g. 10)

Note: When a error message is displayed, users must try to run the query more than one time.This is due to a fail of GeneBank server. Sorry for the inconvenients.