Display information about a sequence gene (Federated Query)

Endpoints: 
Query: 
Select distinct ?label ?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 . ?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://purl.org/dc/terms/title>?article_title . } } } Limit ??number
Statement: 

Display information about a sequence gene $gene$
Limit of result $number$