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H&E stained sections of CAC implant in vivo after 6 weeks. (a) Low magnification image of CAC hydrogel groups including Co (−) BMP (−), Co (+) BMP (−) Co (−) BMP (+), and Co (+) BMP (+), (b) high magnification image of each groups. Reproduced from [89] with permission. Copyright (2015) Elsevier.
