About: http://webisa.webdatacommons.org/299108832

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Selenium is an essential element that has a narrow margin of safety, with the difference between adequate and potentially toxic concentrations in the diet being approximately 10- to 20-fold.
http://www.w3.org/ns/prov#wasQuotedFrom	merckvetmanual.com