Thyroid Stimulating Immunoglobulin

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** An immunoglobulin that can bind to thyrotropin receptors expressed on thyroid gland cells and stimulates excess secretion of the thyroid hormones thyroxine (T4) and triiodothyronine (T3).

**Synonyms:** - TSI