Name	Info	Provider	Link
Stem Cells	free resource	MedlinePlus Health Information	https://medlineplus.gov/stemcells.html
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-PTPRC-1
	free resource	NCI CPTAC Assay Portal	https://assays.cancer.gov/CPTAC-1172
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:9778515
	subscription/membership/fee required	Silverchair Information Systems	https://journals.biologists.com/dev/article-lookup/doi/10.1242/dev.125.22.4575