Name	Info	Provider	Link
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-NT5E-1
Cited by Patents in	free resource	The Lens - Patent Citations Database	https://www.lens.org/lens/search/patent/list?q=reference_cited.nlp.ids.pmid:8196081
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/jnci/article-lookup/doi/10.1093/jnci/86.12.906