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We develop a stochastic model for the dynamics of a dense fluid of flexible linear macromolecules. A polymer is represented by a harmonic chain of beads whose mobilities fluctuate in time between two values. A bead in the low-mobility state does not execute local motions, but may move by a cooperative slithering process involving the entire chain. A bead in the high-mobility state may execute both local and slithering motions. The rate at which the mobilities fluctuate is determineddoi:10.1063/1.471257 fatcat:zofccubgszfmdmb2ul5gtuscq4