Columbia subject headings:
Genetic engineering--Standards--Congresses.
Recombinant DNA--Standards--Congresses.
Harvard subject headings:
Biological products--Standards--Congresses.
Genetic engineering--Standards--Congresses.
Recombinant DNA--Standards--Congresses.
Princeton subject headings:
Biological products--Standards--Congresses.
Genetic engineering--Standards--Congresses.
Recombinant DNA--Standards--Congresses.