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Microscopic images of the multilayer microcapsules. Upper panel shows the microcapsules at the day of fabrication, lower panel shows the microcapsules after incubation for 49 days in 0.9% NaCl. (A) ALA, (B) ALN, (C) APA and (D) APN (magnification, 4×). Black spots in B and D series are NCS precipitates.
