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Figure 4 (A, B) Hematoxylin and eosin staining of the slices in Figure 2A. The white dashed line (white arrow) shows the border between the collagen implant (left side) and the native collagen deposition (right side). The collagen implant is homogeneous red without cells within the implant. The native collagen deposition shows bundle formation with cells (yellow arrows) (A: x200, B: x400). C Hematoxylin and eosin staining of in vitro collagen for implantation. The collagen staining is bright red and homogeneous, similar to that shown in Figure 4B (collagen-treated) (x400).