Name	Info	Provider	Link
	subscription/membership/fee required	American Chemical Society	https://doi.org/10.1021/acs.jmedchem.9b02170
	free resource	NCI CPTAC Assay Portal	https://assays.cancer.gov/CPTAC-68
Phosphodiesterases, 3',5'-cyclic nucleotide (PDEs) - overview and references	free resource	Guide to Pharmacology	https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=260
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:32255344