Christopher Chen of the University of Pennsylvania grew flat sheets of mesenchymal stem cells and exposed them to a mixture of growth factors for bone and marrow development.
来自宾夕法尼亚大学的克里斯托弗·陈(音译)培育了间质干细胞薄片，并将其置于有助于骨骼和骨髓发育的混合生长因子中。
The back skull is flat, without receding either laterally or backward and the occipital bone is not highly peaked.
脑袋平坦，既不向侧面退缩、也不向后面退缩，且后枕骨也不非常突出。
Near the front cylinder, rear side of the flat, flat head, big eyes, long kiss and a sharp , triangular in shape, such as the long mandible, soft bone.
前部近圆筒形，后部侧扁，头扁平，眼大口大，吻长而尖，呈三角形，上下颌等长，骨软。
The first three operations merely reset the bone – "changed the flat, " as Hill liked to say.
前面三次手术调整了骨头的位置，Hill通常喜欢说，“就像改变了公寓的布局”。
The alveolar bone density increased significantly and approached to a flat after one-year's treatment.
而骨密度在治疗后一年内有显著增加，而后趋于平缓。
Conclusions Being flat in shape and rich in blood supply, the iliac bone is a valuable supply bone for foot defects, especially multi-metatarsal and calcaneal ones.
结论髂骨用于重建再造跖骨缺损尤其是多跖骨缺损、跟骨缺损，稳定且触地面积大、承压小；
Methods Based on the anatomic study, the vascularized periosteal flat of the first cuneiform bone was designed to transplant into navicular.
方法在解剖学研究基础上，设计带血管的第一楔骨骨膜瓣植入舟状骨。
Methods Based on the anatomic study, the vascularized periosteal flat of the first cuneiform bone was designed to transplant into navicular.
方法在解剖学研究基础上，设计带血管的第一楔骨骨膜瓣植入舟状骨。
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