| 摘要 |
A method is provided, including in vitro stimulating an initiating cell population (ICP) of at least 5 million cells that have a density of less tha n 1.072 g/ml, and at least 1% of which are CD34+CD45-/dim, to differentiate in to a progenitor/precursor cell population (PCP). A method is provided, includin g in vitro stimulating an initiating cell population (ICP) of at least ten thousand cells that have a density of less than 1.072 g/ml to differentiate into a progenitor/precursor cell population (PCP). A method is provided, including separating lower density cells from higher density cells, the lowe r density cells defining an initiating cell population (ICP), and in vitro stimulating the ICP to differentiate into a progenitor/precursor cell population (PCP). Other embodiments are also described.
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