The physiological viability of the model.

<p>Active pathways at start. The same network as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0078246#pone-0078246-g007" target="_blank">Fig. 7</a>: Here, the pathways that are active when the starting process commences with a protraction (swing phase) are highlighted in green. The other pathways are suppressed by having been drawn in grey. For explanation of how the network works in this case, see text.