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A: Nickel particle glued onto the micro-post is held rigidly by a permanent magnet for one or two days. Stiffness is reduced in real time by removing the magnet. B: Calculation of estimated effective boundary stiffness as a result of holding one of the posts. C: A μ-TUG dish with permanent magnet in the incubator. D: Phase images of micro-tissue before and after removing the magnet.
