A hematopoietic stem cell is defined as

• 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