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Each type of blood cell made by the bone marrow has an important job. Three very important types of white blood cells are essential to the proper functioning of the body's immune system, which fights infection:. Another source of bone marrow stem cells is the blood that circulates in the veins and arteries of all normal people.
These stem cells are known as peripheral blood stem cells PBSC. Patients recovering from chemotherapy and healthy people who are treated with certain drugs that stimulate the growth of the bone marrow have relatively large numbers of PBSC in their blood. The PBSC can be collected and used in certain situations as a source of stem cells for transplantation. Another source of stem cells is the blood found in the placenta of a newborn baby once the umbilical cord is cut.
Umbilical cord blood UCB has been successfully used as a source of bone marrow stem cells for transplantation in both related and unrelated patients. It is for educational purposes only and is not intended to replace the advice of your child's doctor or other health care provider.
We encourage you to discuss any questions or concerns you may have with your child's provider. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of marrow Entry 1 of 2. Definition of marrow Entry 2 of 2. First Known Use of marrow Noun 1 before the 12th century, in the meaning defined at sense 1a Noun 2 , in the meaning defined above. Learn More About marrow. Time Traveler for marrow The first known use of marrow was before the 12th century See more words from the same century.
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