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Deep region of AC (A, B), epiphyseal end of GPC (C, D), and metaphyseal end of GPC (E, F) after incubation in medium supplemented with 10 mM β-glycerophosphate for 3 weeks. Sections are stained with Hematoxylin & Eosin (A, C, E) or Alizarin Red S (B, D, F).
