_:b56592713 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56592712 <http://www.w3.org/ns/oa#hasSelector> _:b56592713 . _:b56592713 <http://www.w3.org/ns/oa#exact> "serum" . _:b56592712 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/8834037938bd709903ef25732dbcfd5ea681a0cf/4> .