Biology
Stem cell banks Learning objectives: • discuss potential benefits and risks associated with the use of stem cells in medicine.
Key words donor gene mutation therapeutic cloning umbilical cord
Scientists predict that, in the future, vast banks of stored stem cells will be available to treat many medical conditions.
Figure 1.35 Stem cells can be stored in liquid nitrogen.
Rejection of stem cell transplants The stem cells from a bank originate from many different people. Rejection of stem cell transplants by a patient’s immune system is, therefore, a problem. One current solution is to find as close a match as possible between donor and patient cells. Another is to give the patient drugs to suppress their immune system. Scientists are looking for other ways to avoid transplant rejection. One possible source of stem cells is blood left in the umbilical cord and placenta after a baby is born. Cord blood is easy to collect and store.
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1
Suggest sources of stem cells that would give the best match between donor and patient.
2
Suggest some possible advantages and disadvantages of having a baby’s blood stored to treat possible disease or injury in later life.
AQA GCSE Biology for Combined Science: Trilogy: Student Book
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5/20/16 10:09 AM