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Representation of the marrow cavity. Small spheres represent mix of various marrow cell types including osteoprogenitor (blue), haematopoietic (brown) and adipose (white). Dark speckled ring represents 10 µm endosteal layer. Rα is the range of the alpha particles from 223Ra decay, thus showing significant sparing of deep marrow haematopoietic stem cells. Reproduced from Hobbs et al27 with permission from IOP Publishing. For colour images please see online.
