Increasing numbers of infiltrating cells into the arterial patch.

<p><b>A</b>) Photomicrographs of bovine pericardial patches, implanted into either an arterial or subcutaneous position, and shown at either high or low magnification. Scale bar, 40 microns. <b>B</b>) Graph of cell count in the patch over time; mean of 4 high power fields per patch; n = 2. *, p<0.0001.</p>