Gardner, D.P., Ren, P., Ozer, S. and Gutell, R. R.
Statistical Potentials for Hairpin and Internal Loops Improve the Accuracy of the Predicted RNA Structure.
J Mol Biol. 2011 Oct 21;413(2):473-83. Epub 2011 Aug 23.

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Source code: RNAfoldCRW.zip