Columbia subject headings:
Immune factor--Regulation--Congresses.
Transfer factor (Immunology)--Congresses.
Transfer factor (Immunology)--Therapeutic use--Congresses.
Harvard subject headings:
Immune factor--Regulation--Congresses.
Transfer factor (Immunology)--Congresses.
Transfer factor (Immunology)--Therapeutic use--Congresses.
Princeton subject headings: