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。
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