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<http://webisa.webdatacommons.org/392343362>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stanford.edu> .
<http://webisa.webdatacommons.org/392343362>	<http://www.w3.org/ns/prov#value>	"He and others believe the reason many cancers return after treatment is that radiation and most forms of chemotherapy kill the quickly dividing cells but leave a significant fraction of the cancer stem cells unharmed." .
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