Mice received injections of calcein (Sigma, Cat#: C0875) and Alizarin Red (Sigma, Cat#: A5533) 7 and 3 days before euthanasia, respectively. Isolated femurs and tibias were dehydrated and embedded in polymethylmethacrylate. Specimens then were cut into continuous 5-μm thick sections with a rotary microtome. Images were captured as previously described (Yang et al., 2020).
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