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. 2022 Mar 21;13(1):19476035221087706. doi: 10.1177/19476035221087706

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© The Author(s) 2022

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Figure 2. — Representative IHC staining of BMP4 in superficial, middle, and deep zones of articular cartilage in normal adults and OA and KBD patients. Scale bar, 20 μm. IHC = immunohistochemistry; BMP4 = bone morphogenetic protein 4; OA = osteoarthritis; KBD = Kashin-Beck disease.