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In page Osteoclast:
"Osteoclast differentiation is inhibited by osteoprotegerin (OPG), which is produced by osteoblasts and binds to RANKL thereby preventing interaction with RANK. It may be important to note that while osteoclasts are derived from the hematopoietic lineage, osteoblasts are derived from mesenchymal stem cells.[3][4]
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