CB CD34+
cells cultured in serum-
free medium (SFM) for 10 days on LDV linked to a PET
film contained twice as many cells able to initiate long-
term hematopoiesis in vitro (LTC-ICs) as those cultured
on PET controls and supported low levels of engraftment
in three of four lethally irradiated immunodeficient mice
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