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A representative fibre-ensemble stress–strain (in Pens−λens) response for (a) native and (b) cross-linked bovine pericardium illustrating a well-defined post-transition fibre recruitment point wherein the response becomes linear. While the native pericardium demonstrated a very low initial modulus (approx. 75 kPa; table 2), the EXLs demonstrate a significantly stiffer modulus. (Online version in colour.)
