The following is an example graph of the CKG. Notice the outgoing connections from Paper nodes to Author and Concept nodes, and from Author nodes to Institution nodes. A paper (blue nodes) is written by authors (yellow nodes), who are affiliated with specific institutions (green nodes). A paper can have multiple authors, and authors can belong to multiple institutions. Concept nodes (red nodes) ar
![Building and querying the AWS COVID-19 knowledge graph | Amazon Web Services](https://cdn-ak-scissors.b.st-hatena.com/image/square/15c98381a6e9dd1a3dbf5f69af80464cc19de314/height=288;version=1;width=512/https%3A%2F%2Fd2908q01vomqb2.cloudfront.net%2F887309d048beef83ad3eabf2a79a64a389ab1c9f%2F2020%2F06%2F01%2FBuilding-and-querying-the-AWS-COVID-19-knowledge-graph-1.png)