Turing structures in a system with regulated gap-junctions.
In two coupled cells, each containing a bisubstrate-kinetics reaction system, the two substrates can cross the membranes through gap-junction protein channels (gating). Passing through the gap-junctions is controlled by one of the substrates, thus resulting in non-linear diffusion. Linear stability analysis gives the conditions, under which the symmetric fixpoint becomes unstable, leading to spatial asymmetry (Turing structures). The implications for morphogenesis are discussed.
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