Chorionic Gonadotropin/physiology; Thyroid Gland/drug effects; Animals; Antigen-Antibody Reactions; Antigens; Biological Assay; Chorionic Gonadotropin/isolation & purification; Chorionic Gonadotropin/urine; Concanavalin A; Cross Reactions; Epitopes; Female; Glycoproteins/physiology; Humans; Immune Sera; Immunologic Techniques; Long-Acting Thyroid Stimulator/physiology; Methylglycosides; Mice; Neutralization Tests; Pregnancy; Rabbits/immunology; Sheep/immunology; Stimulation, Chemical; Thyroid Gland/immunology; Thyrotropin/antagonists & inhibitors; Thyrotropin/physiology; Time Factors; Trophoblasts/metabolism