Chemical Entities of Biological Interest Ontology	Early Pregnancy Ontology	Source
http://purl.obolibrary.org/obo/CHEBI_23965	http://www.semanticweb.org/ontologies/epo.owl#Estradiol	LOOM
http://purl.obolibrary.org/obo/CHEBI_6443	http://www.semanticweb.org/ontologies/epo.owl#Levonorgestrel	LOOM
http://purl.obolibrary.org/obo/CHEBI_50114	http://www.semanticweb.org/ontologies/epo.owl#Estrogen	LOOM
http://purl.obolibrary.org/obo/CHEBI_59826	http://www.semanticweb.org/ontologies/epo.owl#Progestin	LOOM
http://purl.obolibrary.org/obo/CHEBI_17026	http://www.semanticweb.org/ontologies/epo.owl#Progesterone	LOOM
http://purl.obolibrary.org/obo/CHEBI_24621	http://www.semanticweb.org/ontologies/epo.owl#Hormone	LOOM
http://purl.obolibrary.org/obo/CHEBI_25367	http://www.semanticweb.org/ontologies/epo.owl#Molecule	LOOM