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DIC image sequence of mechanical testing. An isolated native type I collagen fibril from bovine sclera is epoxied to calibrated (57 ± 8 nN/μm) glass microneedles, submerged in buffer, and mechanically loaded. Top Gauge length (zero-load). Bottom High-load of 1054 ± 149 nN produces 2.6 ± 0.3 % strain
