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Histological analysis of pericardium samples from in vitro degradation. Samples shown are stained with hematoxylin and eosin to display structure of collagen network. Control pericardium appears to have lost structural integrity after collagenase degradation (D), as did the EtOH dehydrated sample (C), while the sample with PPF reinforcement (B) appears unaltered from the natural pericardium (A).
