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. 2003 Apr 1;31(7):2006–2013. doi: 10.1093/nar/gkg288

Figure 1.

Figure 1

The structure distance is calculated based on the tree representation of RNA structures. Each tree node represents a loop of the secondary structure, and the node label is assigned as the number of branches from the node. The topology of tree represented RNA structures can be encoded into linear strings of node labels using a depth-first traversal of the nodes.