Hematopoietic stem cells are blood cells that give rise to all other blood cells, including white blood cells, red blood cells, and platelets. They have the ability to self-renew, and are specific to the blood. While hematopoietic stem cells can create any type of blood cell necessary, can not become any cell outside of a blood cell. 

They are found in the bone marrow of adults, as well as in umbilical cord blood.