@@ In biology, it is very important to investigate the movement of some cells ororganisms in some given biological system (cf. [1, 2]). In order to understand howthe movement rules are affected by the effect of the chemo-attractant, Othmer and Stevens introduced in [1] several general classes of partial differential equations. In one of their models, they considered a master equation, i.e. barrier and nearestneighbor lattice model. Following a limiting process the model is described by the following system of partial differential equations:
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