Figure 1a. Microscopic pathology of LIMA-to-LAD anastomosis, three months following application of sealant. Low power photomicrograph of the anastomosis of the LAD (arrows) and the LIMA in an animal treated with sealant (A) and one without (B). Fibrosis is seen in both sections, with collagen staining red; the sealant-treated vessel shows a triangular area of collections of macrophages containing the sealant (S). (Verhoff's elastic stain; original magnification 25x).