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The calcium-sensing receptor (CaR) and the vitamin D receptor (VDR) play key roles in calcium homeostasis. The CaR regulates the release of parathyroid hormone (PTH) in response to changes in extracellular calcium, whereas the VDR mediates the effects of calcitriol, the active metabolite of vitamin D. The development of secondary hyperparathyroidism (HPT) is a common complication of chronic kidney...
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