<HTTP://PATHWAYCOMMONS.ORG/PSI2BP#RXR-S000000021> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.biopax.org/release/biopax-level3.owl#RelationshipXref> .
<HTTP://PATHWAYCOMMONS.ORG/PSI2BP#RXR-S000000021> <http://www.biopax.org/release/biopax-level3.owl#db> "sgd"^^<http://www.w3.org/2001/XMLSchema#string> .
<HTTP://PATHWAYCOMMONS.ORG/PSI2BP#RXR-S000000021> <http://www.biopax.org/release/biopax-level3.owl#id> "S000000021"^^<http://www.w3.org/2001/XMLSchema#string> .