Name	Info	Provider	Link
Vitamin A	free resource	MedlinePlus Health Information	https://medlineplus.gov/vitamina.html
	subscription/membership/fee required	Wiley	https://doi.org/10.1002/jcb.24177
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-NANOG-2
	free resource	NCI CPTAC Assay Portal	https://assays.cancer.gov/non-CPTAC-2677