21. Microgravity impedes the development of bone cells . 22. The researchers discovered that mice lacking a key estrogen-regulating protein were unable to grow enough bone cells . 23. He researched the deformation of bone cells . 24. Cultured on bone material, they will form bone cells ; in a gel, they grow into cartilage-making cells. 25. Recent research has also implicated these novel receptors in muscle growth and bone cell differentiation and proliferation. 26. The fossil shows many details of these, even the internal structure of some muscle and bone cells . 27. EIKF2AK3 is also involved in bone cells . 28. This is important because without the bone morphogenetic proteins the bone cells would turn into fat cells. 29. Normally, when a bone undergoes physical stress, the body forms new bone cells to offset the pressure. 30. Over time, bone cells from the patient would grow into these spaces and fix the stem in position.
