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In gene therapy of Adenosine Deaminase (ADA) deficiency, the patient requires periodic infusion genetically engineered lymphocytes because:
A
Genetically engineered lymphocytes are not immortal cells.
B
Retroviral vector is introduced into these lymphocytes.
C
Gene isolated from marrow cells producing ADA is introduced into cells at embryonic stages
D
Lymphocytes from patient's blood are grown in culture, outside the body.
The answer is A.