The first clinical gene therapy was given in $1990$ to a $4$-year-old girl with an enzyme deficiency of:

Which one of the following genes is defective in patients suffering from Severe Combined Immunodeficiency Disease $(SCID)$?

Human insulin is produced from which transgenic species?

At present, about . . . . . . recombinant therapeutics have been approved for human use, the world over.

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

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.