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Drug repurposing network. (a) Illustration of the four-layered heterogeneous graph with the inter-layer and the intra-layer connections. (b), (c) and (d) Subgraphs centered around the drugs Dexamethasone, Ivermectin and Simvastatin, respectively, illustrate shared target genes between these drugs and COVID-19 disease nodes (see description later on in Section 4.8).
