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Top: force or work required to pull PMMA cylinders (uncoated or coated with HAp from the polydopamine + 11-MUA group) out of porcine corneas. Data are means ± SD. n = 4. *P < 0.05 for load; *P < 0.01 for work. Bottom: SEM images of cylinder surfaces after withdrawal from a cornea. Scale bar, 5 μm. The area shown for PMMA is particularly dense; that for HAp is representative.
