Two possible sources of replacement cells are a patient's own adult stem cells and embryonic stem cells from an unrelated donor. Both can produce the required cell type.
Why might the patient's own cells be preferred?
They form more types of body cell and are less likely to be rejected.
They are a closer tissue match and are less likely to be rejected.
They are a closer tissue match and cannot undergo uncontrolled division.
They form more types of body cell and cannot carry infectious agents.
46 exam-style questions on Edexcel GCSE Biology 2.2 Stem cells, covering 2.2.1 Function of stem cells and meristems and 2.2.2 Benefits and risks of stem cells. Each one has a worked solution and a mark scheme showing where the marks go.