{"value":"ortholog","explanation":"the node is a KO (ortholog group)"}
{"value":"enzyme","explanation":"the node is an enzyme"}
{"value":"gene","explanation":"the node is a gene product (mostly a protein)"}
{"value":"group","explanation":"the node is a complex of gene products (mostly a protein complex)"}
{"value":"compound","explanation":"the node is a chemical compound (including a glycan)"}
{"value":"map","explanation":"the node is a linked pathway map"}