_:b56423060	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/765e023ee18436394fa56d1b2a388422e6201804/3> .
_:b56423060	<http://www.w3.org/ns/oa#hasSelector>	_:b56423061 .
_:b56423061	<http://www.w3.org/ns/oa#exact>	"natural killer cells" .
_:b56423061	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .