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==Narrow escape== The [[narrow escape problem]] is a ubiquitous problem in biology, biophysics and cellular biology which has the following formulation: a Brownian particle ([[ion]], [[molecule]], or [[protein]]) is confined to a bounded domain (a compartment or a cell) by a reflecting boundary, except for a small window through which it can escape. The narrow escape problem is that of calculating the mean escape time. This time diverges as the window shrinks, thus rendering the calculation a [[singular perturbation]] problem.
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