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Chondrocyte to osteoblast transformation. Alpha-SMA = alpha smooth muscle actin. (Reproduced from: Bahney CS, Zondervan RL, Allison P, Theologis A, Ashley JW, Ahn J, Miclau T, Marcucio RS, Hankenson KD. Cellular biology of fracture healing. J Orthop Res. 2019 Jan;37[1]:35–50.)
