Abstract
The fetal sheep competitive engraftment model of human hematopoietic stem cells (HSC) was used to evaluate the in vivo engraftment potential of human bone marrow CD34- Lin- cells. Transplantation of CD34- Lin- cells into primary hosts resulted in the long-term (> 1 year) engraftment and multilineage donor cell/progenitor expression with production of significant numbers of CD34+ cells. Secondary transplantation and limiting dilution studies confirmed the presence in human CD34- fraction of HSC with in vivo long-term engraftment and multilineage differentiation potentials.
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