Systems Biology Ontology	Natural Products Ontology	Source
http://biomodels.net/SBO/SBO_0000287	http://www.owl-ontologies.com/NPOntology.owl#EC50	LOOM
http://biomodels.net/SBO/SBO_0000249	http://www.owl-ontologies.com/NPOntology.owl#Polysaccharide	LOOM
http://biomodels.net/SBO/SBO_0000244	http://www.owl-ontologies.com/NPOntology.owl#Receptor	LOOM
http://biomodels.net/SBO/SBO_0000014	http://www.owl-ontologies.com/NPOntology.owl#Enzyme	LOOM
http://biomodels.net/SBO/SBO_0000288	http://www.owl-ontologies.com/NPOntology.owl#IC50	LOOM
http://biomodels.net/SBO/SBO_0000408	http://www.owl-ontologies.com/NPOntology.owl#BiologicalActivity	LOOM
http://biomodels.net/SBO/SBO_0000412	http://www.owl-ontologies.com/NPOntology.owl#BiologicalActivity	LOOM