胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
早期阶段的幼胚培养成苗与外源激素有一定关系。
Plants normally grown at early stage in young embryos are related to exogenous hormones.
目的：探讨体外诱导外胚间充质细胞向骨骼肌细胞分化的潜能，利用分化细胞构建组织工程骨骼肌模型。
AIM:To investigate the ability of dimethyl sulphoxide(DMSO) on inducing the ectomesenchymal cells to skeleton muscle cells and using these cell to construct the three-dimension model.
本试验用外源植物DNA处理水稻离体胚，并获取胚的再生植株。
Rice plants can be regenerated from the in vitro embryo treated by exogenous plant DNA in the experiment.
我们利用二维培养将胚胎干细胞分化为具有外胚和间充质特性的细胞，再将这些细胞复合入三维上皮组织。
We derived cell populations with properties of ectodermal and mesenchymal cells in 2D culture and incorporated these divergent cell populations into 3D epithelial tissues.
资料与方法搜集5例骨原始神经外胚叶肿瘤的影像及临床、手术病理资料，分析其影像学表现。
Materials and Methods The radiological features, clinic and pathological data of 5 patients with bone PNETs were retrospectively analyzed.
结论溶骨性骨破坏和巨大软组织肿块是骨原始神经外胚叶肿瘤的常见影像学表现，病灶内钙化和局部淋巴结肿大少见。
Conclusion The osteolytic lesion and a large soft tissue mass are common radiological appearances of bone PNETs and calcification and regional lymphadenopathy are rarely seen.
在培养基中加入外源激素和多种氨基酸可以提高胚状体的诱导效率，平均比对照增加59.64%；
The added exogenous hormone and poly amino acid to culture medium can improve the inductivity of embryoid, increasing averagely 59.64% than that of the contrast.
利用水稻成熟胚为外植体，接种在NB培养基上，分别附加不同的外源激素，以诱导愈伤组织并促其分化，最终获得水稻再生植株。
The mature embryos were cultivated on NB media with different hormones, by using the mature embryos in rice as explants, and regeneration plants were obtained successfully.
外源生长素和细胞分裂素是诱导离体培养细胞分化与增殖所必需的，2，4-D是诱导胚性愈伤组织的重要激素。
The exogenous auxin and cytokinin are necessary to induced differentiation and proliferation of cells of culture in vitro. 2,4-D is an important hormone of induced embryogenic calluses.
牙齿是典型的上皮-间充质器官，由原口腔上皮和其下方的神经嵴来源的外胚间充质相互作用而形成。
Tooth is a typical epithelium-mesenchyme organ, which is formed through the mutual function between the original oral epithelium and epiblastic mesenchyme from the neural crest below.
牙齿是典型的上皮-间充质器官，由原口腔上皮和其下方的神经嵴来源的外胚间充质相互作用而形成。
Tooth is a typical epithelium-mesenchyme organ, which is formed through the mutual function between the original oral epithelium and epiblastic mesenchyme from the neural crest below.
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