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. 2017 Oct 10;11:95. doi: 10.1186/s12918-017-0472-7

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Schematic diagrams of the network structures of the six 3-node biochemical oscillator models. Each model includes three nodes (X, Y, and Z) and nine possible interactions (Lxx, Lxy, Lxz, Lyx, Lyy, Lyz, Lzx, Lzy, and Lzz). The term ‘Lpq’ denotes an interaction in which node P is influenced by node Q. For instance, Lxy denotes an interaction in which node X is influenced by node Y. The figure shows the six network structures: a simple NFO; b activator-amplified NFO; c inhibitor-amplified NFO; d type 1 incoherently-amplified NFO; e type 2 incoherently-amplified NFO; and (f) type 3 incoherently-amplified NFO in order of appearance