A、a cell with extensive self-renewal and proliferative potential

B、 .a cell only to produce dauctor cells with identical characteristics

C、 .a cell with the capaaty to differentiate into the progenitars of all the blood cell lineages

D、 a cell with the capacity to produce some hematopoietic growth factors such as SCF，GM-CSFs et al

E、 .a cell with the capaaty to express some specific surface antigens such as CD34