Columbia subject headings:
Biotechnology.
Genetic engineering.
Insulin--Synthesis.
Recombinant DNA.
Harvard subject headings:
Biotechnology.
Genetic engineering--Popular works.
Genetic engineering.
Insulin--Biotechnology--Popular works
Insulin--Synthesis
Recombinant DNA--Popular works.
Recombinant DNA.
Princeton subject headings:
Biotechnology.
Genetic engineering.
Insulin--Synthesis.
Recombinant DNA.