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a Dynamics of free BMP in the presence of feedback that enhances receptor binding. b Dynamics of BMP-receptor levels leads to a stable population of high signaling states. c Dynamic evolution to equilibrium solution (black line) of individual cells labeled 1–9 for distance away from the dorsal midline. Cells 1–6 reach and maintain a high signaling state, whereas cells 7–9 revert back to the low signaling state. From Umulis et al. (2006) with permission
