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. 2012 Jan 23;7(1):e29952. doi: 10.1371/journal.pone.0029952

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de Boer, Hogeweg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The different secondary structures which are defined to be functional in our model universe. (a) Target set 1, (b) target set 2, (c) the number of secondary structure (from a million random RNA-sequences of length ) which fold into a specific shapiro structure. In red are the shapiro structures of target set 1, in green those from target set 2. Note that only a part of the distribution is shown. A total of 2130 Shapiro structures with an abundance of less then 100 secondary structure is not shown.

Inline graphic — The different secondary structures which are defined to be functional in our model universe. (a) Target set 1, (b) target set 2, (c) the number of secondary structure (from a million random RNA-sequences of length ) which fold into a specific shapiro structure. In red are the shapiro structures of target set 1, in green those from target set 2. Note that only a part of the distribution is shown. A total of 2130 Shapiro structures with an abundance of less then 100 secondary structure is not shown.