Assertion: osteoblast | /r/CapableOf | secrete the bone matrix
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Source sentences:
text: Osteoclasts are attached to the old bone area, secreting acidic substances to dissolve minerals, secreting protease to digest the bone matrix, and forming a bone resorption lacuna; thereafter, the osteoblasts migrate to the absorbed site, secreting the bone matrix, and the bone matrix is mineralized and form new bones.