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Scanning electrophotomicrographs of scaffold constructs with (A,B) and without (C,D) P3 equine hoof progenitor cells from an unaffected hoof 9 weeks after subcutaneous implantation in athymic mice. Arrow = collagen fibrils; Arrow head = organized extracellular matrix; Magnification = 6,000X (A,C), 3000X (B,D).
