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Model of diffusion of DMFU and FU in the Rf-PEG hydrogel where the relative size of the PEG–water phase (or region) has been scaled down significantly relative to the Rf core/IPDU intermediate-layer region. A (black dot) represents FU or DMFU in the PEG–water phase and B (gray dot) represents FU or DMFU in the Rf core/IPDU intermediate-layer region. The diffusive exchange rate constants are given as k + and k − for A to B and B to A, respectively
