Examples of Diversity Graphs. The binary representation of two diversity graphs is visualized after structural compression, which maps all metabolically redundant nodes of same connectivity onto a super-node. The super node is depicted with black color and labeled with the letter s. The highly central nodes are depicted with red color and the names of the corresponding deleted genes are shown. All highly central nodes are connected with the super node. (Left) The diversity graph of pyruvate. 7 highly connected nodes are identified. 373 nodes comprise the super-node. (Right) The diversity graph of D glucose. The graph consists of 13 highly connected nodes and the super-node includes 373 nodes.