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. 2011 May 5;39(15):6692–6704. doi: 10.1093/nar/gkr252

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© The Author(s) 2011. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Alternative (MSL) structure of the FIV packaging signal. 1M7 reactivities determined as before were used as pseudo free-energy constraints in a minimal free energy folding algorithm (RNAstructure). Nucleotide reactivities are colour-coded as shown in the key and numbered with a dash every 10 nt.