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In gene therapy of adenosine deaminase (...

In gene therapy of adenosine deaminase (ADA) defieciency, the patient requires periodic infusion of gentically engineered lymphocytes because:

A

Retroviral vector is introduced into these lymphocytes

B

Gene isolated from marrow cells producing ADA is introduced into cellsat embryonic stages

C

Lymphocytes from patient's blood are grown in culture outside the body

D

Genetically engineered lymphocytes are not immortal cells

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