Circulating Osteoblast-Lineage Cells in Humans

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Abstract
Although current evidence suggests that only a minuscule number of osteoblast-lineage cells are present in peripheral blood, we hypothesized that such cells circulate but that their concentration has been vastly underestimated owing to the use of assays that required adherence to plastic. We further reasoned that the concentration of these cells is elevated during times of increased bone formation, such as during pubertal growth.