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== TSH Receptor and M22 antibody ==

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The thyrotropin receptor (or TSH receptor or TSHR) is a member of the G protein-coupled receptor superfamily of integral membrane proteins and is coupled to the Gs protein. It is on the surface of thyroid follicular cells. Once stimulated by TSH (Thyroid-Stimulating Hormone), THSR activates the production of thyroid hormones: thyroxine (T4) and triiodothyronine (T3).