Name	Info	Provider	Link
Calcium	free resource	MedlinePlus Health Information	https://medlineplus.gov/calcium.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=27170091.ui
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-PGR-2
	subscription/membership/fee required	Cambridge University Press	https://www.cambridge.org/core/product/identifier/S0007114516001768/type/journal_article
	free resource	scite Smart Citations	https://scite.ai/reports/27170091