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(A) Chemical structure of crosslinking site of alginate-based U-4CR microgels crosslinked by PEG-diamine and corresponding phase-contrast microscopy image, including mean and standard deviation of the microgels. (B) Chemical structure of crosslinking site of chitosan-based U-4CR microgels crosslinked by PEG-dialdehyde and corresponding phase-contrast microscopy image, including mean and standard deviation of the microgels.
