Columbia subject headings:
Gossypol--Physiological effect.
Gossypol--Testing.
Infertility, Male.
Oral contraceptives, Male.
Harvard subject headings:
Gossypol--Physiological effect.
Gossypol--Testing.
Infertility, Male
Oral contraceptives, Male
Princeton subject headings:
Gossypol--Physiological effect.
Gossypol--Testing.
Infertility, Male.
Oral contraceptives, Male.