Name	Info	Provider	Link
	subscription/membership/fee required	HighWire	https://jpet.aspetjournals.org/lookup/pmidlookup?view=long&pmid=22911925
	free resource	NCI CPTAC Assay Portal	https://assays.cancer.gov/non-CPTAC-3609
A1: Pepsin - overview and references	free resource	Guide to Pharmacology	https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=726