More recently, scientists have developed ways to derive hematopoietic stem cells from the blood contained in the umbilical cord and placenta at birth. The stem cells isolated from a person's own umbilical cord blood and placenta, if used for therapies later in life, would be less likely to cause an "internal war" within the recipient's body. They are also more accessible than the stem cells in bone marrow because the extraction of this blood poses no risk to the mother or infant.
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