Which of the following statements accurately reflects current stem cell research?
a) The stem cell is known as a precursor cell that continually replenishes the body's entire supply of both red and white cells.
b) Stem cell transplantation cannot restore immune system functioning.
c) Clinical trials are underway in patients with acquired immune deficiencies only.
d) Stem cell transplantation has been performed in the laboratory only.
Answer: A
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