Name	Info	Provider	Link
OPRD1	free resource	BioCyc	https://biocyc.org/gene?orgid=HUMAN&id=HS04007
Gene Ontology annotations from this paper	free resource	Gene Ontology	http://amigo.geneontology.org/amigo/reference/PMID:7808419
	free resource	GlyGen glycoinformatics resource	https://glygen.org/publication/PubMed/7808419/
	subscription/membership/fee required	HighWire	http://molpharm.aspetjournals.org/cgi/pmidlookup?view=long&pmid=7808419
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-GST+Mu1-6
delta receptor - data and references	free resource	Guide to Pharmacology	https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=317
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:7808419