Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.
哺乳动物将营养物质输送到骨细胞的微小管道是平行排列的，而鸟类的管道则是随机排列的。
In the allografts, there is little or no vessel in-growth in the center of the graft, whereas the autograft shows abundant new vessel networks in the bone substance.
同种异体骨中有少量或没有血管长入，而相同时段的自体骨移植中有大量的新生血管网。
Results Plexiform bone and osteon banding were mostly observed in nonhuman bones, whereas rarely in human bones.
结果丛状骨和骨单位带在猪、牛、羊、狗的密质骨中广泛存在，人骨组织中几乎不见；
Autogenous, homogenous, allograft or allogeneic cell could be used in bone tissue engineering, whereas heterogenous cell could not be used in bone tissue engineering.
自体、同胎及同种异体或同种异基因细胞均可作为组织工程骨可靠的细胞来源，单纯异种成骨细胞不能作为组织工程骨的细胞来源。
Whereas mice with their prion-protein gene knocked out seem to be healthy, it is thought that the gene might also help to regulate the growth of stem cells in the brain and bone marrow, Pfeifer says.
然而那些被敲除了普粒子蛋白基因的老鼠看起来很健康，Pfeifer认为这个基因可能也有助于调节大脑和骨髓的干细胞的生长。
Whereas mice with their prion-protein gene knocked out seem to be healthy, it is thought that the gene might also help to regulate the growth of stem cells in the brain and bone marrow, Pfeifer says.
然而那些被敲除了普粒子蛋白基因的老鼠看起来很健康，Pfeifer认为这个基因可能也有助于调节大脑和骨髓的干细胞的生长。
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