<http://ns.inria.fr/covid19/PMC7139703#title>	<http://purl.org/dc/terms/subject>	"Enzymes" .
<http://ns.inria.fr/covid19/PMC7139703#title>	<http://purl.org/dc/terms/subject>	"EC 3.2" .
<http://ns.inria.fr/covid19/PMC7139703#title>	<http://purl.org/dc/terms/subject>	"Purines" .