About: http://webisa.webdatacommons.org/301982817

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	Thimerosal is a preservative, so it could not be used in live, attenuated vaccines like MMR. This means that MMR is (and always has been) mercury free.
http://www.w3.org/ns/prov#wasQuotedFrom	volokh.com