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Receptors, Calcium-Sensing
CASR Protein; Ca-Sensing Receptors; Ca2+-Sensing Receptor; Calcium Receptors; Calcium-Sensing Receptor Protein; Calcium-Sensing Receptors; Extracellular Calcium-Ion Sensing Receptor; Parathyroid Calcium-Sensing Receptor; Receptor, Ca-Sensing
A class of G-protein-coupled receptors that react to varying extracellular CALCIUM levels. Calcium-sensing receptors in the PARATHYROID GLANDS play an important role in the maintenance of calcium HOMEOSTASIS by regulating the release of PARATHYROID HORMONE. They differ from INTRACELLULAR CALCIUM-SENSING PROTEINS which sense intracellular calcium levels.