1. KEGGgraph::KEGGEdgeSubtype
    KEGG edge subtypes
  2. KEGGgraph::KEGGEdgeType
    KEGG edge types
  3. KEGGgraph::KEGGNodeType
    KEGG node types
  4. KEGGgraph::KEGGPATHID2NAME
    KEGG pathway identifier to name
    AnnDbBimap