At present,about ........ recombinant therapeutics have been approved for human use the world over. Out of these,........ are being marketed in India.

The vaccine for Hepatitis-$B$ is produced from ...... by ...... .

Some of the steps involved in the production of humulin are given below. Choose the correct sequence.
$(i)$ Synthesis of gene $(DNA)$ for human insulin artificially.
(ii) Culturing recombinant $E. coli$ in bioreactors.
(iii) Purification of humulin.
(iv) Insertion of human insulin gene into plasmid.
$(v)$ Introduction of recombinant plasmid into $E. coli$.
(vi) Extraction of recombinant gene product from $E. coli$.

In the modern era,animal cell culture is extensively used for the production of:

In which year did the company Eli Lilly prepare two $DNA$ sequences corresponding to $A$ and $B$ chains of human insulin?

Which of the following peptide chain is removed during the maturation of proinsulin into insulin?