{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7223271#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Natural environment based therapies",
          "Rolling animals",
          "Molecular biology",
          "Gene expression",
          "Cryogenian first appearances"] } } }
