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Representative H&E images of explanted tissues from the mouse heterotopic bone growth model for keratin hydrogels or collagen sponges with (+) rhBMP-2 or without (−) (rhBMP-2). Keratin formulations are indicated as KOS:KTN ratio by weight percentage. B, residual biomaterial (keratin or collagen); C, cortical bone; M, marrow; T, connective tissue; H&E, hematoxylin and eosin. Scalebars indicate 1 mm.
