<http://caligraph.org/ontology/Contrast_agent>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Contrast_agent>	<http://www.w3.org/2000/01/rdf-schema#label>	"Contrast agent" .
<http://caligraph.org/ontology/Radiocontrast_agent>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Contrast_agent> .
<http://caligraph.org/ontology/Contrast_agent>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Contrast_agents> .
<http://caligraph.org/ontology/MRI_contrast_agent>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Contrast_agent> .
<http://caligraph.org/ontology/Contrast_agent>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Chemical_substance> .
<http://caligraph.org/ontology/Ultrasound_contrast_agent>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Contrast_agent> .