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Figure 5 Representative CD-3 staining of a graft site. The micrograph shows a graft site stained with an antibody to CD-3 to stain immune cells. Some scattered macrophages can be identified in and around the graft site. Some of the macrophages can be seen in association with an area of the containing giant cells. There is no collection of infiltrating immune cells at the graft site to indicate any ongoing immune reaction. The dotted line demarcates an area of viable myocardium. The stars highlight the area with giant cells. Arrows mark the surviving transplanted muscle cells, and the arrowheads mark the CD-3 positive macrophages.