$ADA$ deficiency can be cured by

Which of the following is a correct statement with respect to animal insulin?

Correct chronological order of the steps occurring during gene therapy are
$I$. Lymphocytes are obtained from the patients
$II$. Lymphocytes are transferred to the culture dishes
$III$. Lymphocytes are transfected with the normal $ADA$ genes
$IV$. The transfected cells are returned to the patients
The chronological order should be

In which therapeutic method is the functional $ADA-cDNA$ introduced into the patient's lymphocytes?

In which disease is $\alpha-1$ antitrypsin used for treatment?

Somatostatin or human growth hormone $(HGH)$ was first genetically isolated by: