About: http://webisa.webdatacommons.org/259452586

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	it is been very difficult and there have been a number of obstacles, including the fact that it is very hard to make good samples of these viruses.
http://www.w3.org/ns/prov#wasQuotedFrom	bnl.gov