Columbia subject headings:
Genetic engineering--Periodicals.
Molecular cloning--Periodicals.
Recombinant DNA--Periodicals.
Harvard subject headings:
Genetic engineering--Periodicals.
Molecular cloning--Periodicals.
Recombinant DNA--Periodicals.
Princeton subject headings:
Genetic engineering--Periodicals.
Molecular cloning--Periodicals.
Periodicals.
Recombinant DNA--Periodicals.