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Fig. 3 | BMC Bioinformatics

Fig. 3

From: Bi-objective integer programming for RNA secondary structure prediction with pseudoknots

Fig. 3

Different cases of forbidden base pairs in RNA secondary structures with pseudoknots. a The base i of level p cannot be paired with several bases at the same time, from the same or different level; and the base pair between the bases i and j cannot exist on two different levels p and q at the same time. b Two base pairs ij and i′j′ forming a pseudoknot cannot exist at the same level p

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