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The endocardial surfaces (arrows) of (A, B) both expanded polytetrafluoroethylene and (C, D) polyester urethane urea were completely endothelialized at 4 weeks as evidenced by (A, C) hematoxylin and eosin and (B, D) immunohistochemical stain against vWF factor displaying endothelial cells (red) with nuclear staining in blue.
