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. 2014 Jul 22;9(7):e102718. doi: 10.1371/journal.pone.0102718

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© 2014 Guo et al

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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(a) initial condition of Y and S: high concentrations (Y = 1.0 and S = 0.5) inside the rectangle (5 space steps wide ×80 space steps long) and low concentrations (Y = 0.0 and S = 0.0) outside that rectangle. (b, c) a first activator peak emerges at the open end of the rectangularly-shaped YS domain, marked by the asterisk. (d, e, f, g) this first activator peak induces new activator peaks to form along the YS domain, marked by double-arrows, in a wave-like manner, until the YS domain is filled up. Parameters: = 0.002, = 0.16, = 0.04, = 0.03, = 0.0001, = 0.02, = 0.26.

Inline graphic — (a) initial condition of Y and S: high concentrations (Y = 1.0 and S = 0.5) inside the rectangle (5 space steps wide ×80 space steps long) and low concentrations (Y = 0.0 and S = 0.0) outside that rectangle. (b, c) a first activator peak emerges at the open end of the rectangularly-shaped YS domain, marked by the asterisk. (d, e, f, g) this first activator peak induces new activator peaks to form along the YS domain, marked by double-arrows, in a wave-like manner, until the YS domain is filled up. Parameters: = 0.002, = 0.16, = 0.04, = 0.03, = 0.0001, = 0.02, = 0.26.