Fig. 1From: The virome: a missing component of biological interaction networks in health and diseaseExamples of biological interaction networks. a Single data type network (for example, genes). Nodes are represented by circles, and edges (interactions) as black arrows. b Mixed-type biological network showing interactions between genes, proteins and species (for example, viruses, bacteria). Masked area (gray) indicates missing subgraph (for example, viral taxa)Back to article page