We investigate a reaction-diffusion system which consists of a set of three partial differential equations. Due to the reaction kinetics the system can be referred to as a 1-activator-2-inhibitor system. We show, that such systems are capable of supporting localized moving structures, so called quasi-particles. For certain parameters it is possible to predict the propagation speed for these solutions as well as their behaviour in scattering processes. In more general case we have carried out simulations which reveal different scattering results depending on the parameters. We find annihilation, reflection and merging of particles.
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