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