.......... works on the principle of antigen-antibody interactions.

Eli Lilly,an American company,is famous for:

When and on whom was the first clinical gene therapy experiment performed?

Euphenics is

The given figure represents pro-insulin. Identify the $A, B$ and $C$ peptides corresponding to $P, Q$ and $R$ respectively.

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.