Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34585053.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34585053/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34585053
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1002/ags3.12460
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-CD4-2