<http://webisa.webdatacommons.org/199862516>	<http://www.w3.org/ns/prov#value>	"Some metal ions, such as copper and zinc, are essential nutrients and catalysts in biochemical reactions." .
<http://webisa.webdatacommons.org/prov/406961191>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/199862516> .
<http://webisa.webdatacommons.org/199862516>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<openthesis.org> .
<http://webisa.webdatacommons.org/prov/125208525>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/199862516> .
<http://webisa.webdatacommons.org/199862516>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .