Magic bullets are the

The first clinical application of gene therapy was used in $1990$ on a four-year-old girl for:

Given below is the sequence of events in the production of human insulin by Eli Lilly.
$(a)$ Preparation of two $DNA$ sequences corresponding to chain $A$ and $B$ of human insulin.
$(b)$ Production of chain $A$ and $B$ separately.
$(c)$ Introduction of chains in plasmids of $E. coli$.
$(d)$ Extraction of chain $A$ and $B$ and combining them by creating disulphide bonds.
Choose the correct sequence of events.

An example of gene therapy is .......

In gene therapy of Adenosine Deaminase $(ADA)$ deficiency,the patient requires periodic infusion of genetically engineered lymphocytes because

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