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<http://webisa.webdatacommons.org/33147271>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .
<http://webisa.webdatacommons.org/prov/302628121>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/33147271> .
<http://webisa.webdatacommons.org/33147271>	<http://www.w3.org/ns/prov#value>	"acids and other factors also play important roles in" .