Extract all proteins stored in Pathwaycommons Endpoint

Database: 
Statement: 

Display all protein stored in Pathwaycommons endpoint. Display a maximum of $number$ (e.g. 100) results.

Query: 
select* where { ?s<http://www.w3.org/1999/02/22-rdf-syntax-ns#type><http://www.biopax.org/release/biopax-level3.owl#Protein> . } Limit ??number
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