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. 2017 Nov 6;18:468. doi: 10.1186/s12859-017-1882-7

Fig. 1.

Fig. 1

Schematic illustration of local search. Given an initial sequence (i.e., a point in the sequence space), secondary structure prediction is applied to obtain the corresponding secondary structure (i.e., a point in the structure space). Based on the difference between the predicted and target structures, the sequence is updated. After repeating the update until a termination condition is met, the best sequence is chosen from the set of generated sequences