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We report on Monte Carlo results of diffusion coefficients of lattice starpolymers trapped inside a fixed network (de Gennes model). It is found that ourdata are in agreement with the Helfand-Pearson exponential factor \alpha=0.29.For the pre-exponential power law exponent we find \beta=2. In contrast toexisting theoretical predictions, we find that the number of arms f leads to apre-exponential factor of the form exp(-0.75 f).Comment: 7 pages, to appear in Macromolecule

Reptation of Star Polymers in a Network: Monte Carlo Results of Diffusion Coefficients