Increasing numbers of infiltrating cells into the arterial patch.

A) 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) Graph of cell count in the patch over time; mean of 4 high power fields per patch; n = 2. *, p<0.0001.