In gene therapy of adenosine deaminase $\text{(ADA)}$ deficiency,the patient requires periodic infusion of genetically engineered lymphocytes because:

  • A
    Gene isolated from marrow cells producing $\text{ADA}$ is introduced into cells at embryonic stages.
  • B
    Lymphocytes from patient's blood are grown in culture,outside the body.
  • C
    Retroviral vector is introduced into these lymphocytes.
  • D
    Genetically engineered lymphocytes are not immortal cells.

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