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Table 1 Classification of previous work

From: Accurate multiple sequence-structure alignment of RNA sequences using combinatorial optimization

  tree-based annotated sequences probabilistic graph-based
structure-to-structure [20-22,61] [22,25,26,62] [34] [14,41,43]
structure-to-unknown -- [22] [34,38] [14,41,43]
unknown-to-unknown -- [22,27–29,31] [37] [14,41,43]