About: http://webisa.webdatacommons.org/337958876

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	The duckbill valve is preferably coated with materials such as heparin or silicone that prevent thrombosis and prevent unwanted permanent sealing of the valve leaflets.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca