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Placental/umbilicalcordblood (PCB)isrichinhematopoieticstem/progenitorcells ,whichhavehighproliferativepotential.Recently ,PCBhasbeenusedasasourceofhematopoieticstemcellstransplantation .Thefirstsuccessfulpla centalcordbloodstemcelltransplantion (PCBSCT)w