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GTKO porcine pericardial bioprosthesis, top row: newly made before undergoing AWT, and bottom row: after 200 million cycles of AWT. Post-AWT, the pericardium was slightly discoloured, with no visible damage, and the leaflets were deformed into a trifoil shapes (as happens following pericardium pressure fixation). The serrated leaflet suture line is visible in red colour
