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Lateral force versus (a) aggrecan layer height, (b) normal strain ɛn, and (c) GAG spacing normalized to the Debye length, using an OH-functionalized microsized tip (R ∼2.5 μm) in NaCl solutions, pH ∼5.6. Each data point represents one lateral signal loop. Normal strain ɛn was calculated as the compressed aggrecan layer height normalized to its uncompressed height (12).
