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IL-1RA secretion and immunoisolation characteristics of the microcapsules. A: White field microcapsules, which were spherical, smooth, and of uniform size; B: Fluorescence of microcapsules at 1 week and 4 weeks; C: IL-1RA secretion from microcapsules; D: The intact APA microcapsules prevented the entry of the fluorescein isothiocyanate-immunoglobulin G.
