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. 2016 Jul;13(120):20160179. doi: 10.1098/rsif.2016.0179

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© 2016 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — All 104 topologically distinct motifs, colour-coded according to the four categories described in the text. These are motifs containing (i) no feed-forward loops, and no two-node or three-node feedback loops (pink), (ii) no feed-forward loops, and two-node or three-node feedback loops (red), (iii) feed-forward loops and no three-node feedback loops (blue), and (iv) feed-forward loops and three-node feedback loops (purple).