那么这些细胞是如何分化并形成像根、茎、叶和果实那样不同的结构的呢？
How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits?
恐龙在很早以前就从鳄鱼家族的家谱中分化出来了，这一论点是古生物学家在周三根据新发现的二百四十万年前的祖龙化石提出的。
Dinosaurs split off early from the crocodile family tree, paleontologists suggested Wednesday, based on the discovery of a 240-million-year-old fossil "archosaur."
这并不能排除贾第虫属和副基总目的早期分化，回答这样的问题需要知道真核生物树的根在哪里，这是个难题。
This does not preclude an early divergence for both Giardia and parabasalids, for this depends on where the root of the eukaryotic tree lies, which is difficult to resolve.
用长1厘米以上和长0.1厘米的幼穗高体培养，其愈伤组织主要是分化根；
Roots were mainly differentiated from the callus of inflorescences while they were 0.1cm and over 1.0cm in length.
结论：从未退变的椎间盘分离的纤维环细胞能在体外分化为脂肪细胞、格根包尔氏细胞、软骨细胞、神经元及内皮细胞。
Conclusions Anulus fibrosus cells isolated from nondegenerative intervertebral discs can differentiate into adipocytes, osteoblasts, chondrocytes, neurons, and endothelial cells in vitro.
结果表明：诱导愈伤组织分化芽或根所用的外源CTK/IAA值同分化出芽或根的愈伤组织的内源CTK/IAA值呈负相关；
The relation between the level of exogenous CTK/IAA for inducing differentiation and the level of endogenous CTK/IAA in callus with bud or root differentiation is negative.
毛球之上的细胞形成毛发，产生由分化的表皮细胞构成的同心环状区，形成内根鞘和外根鞘。
The hair is formed from cells just above the bulb, which also give rise to concentric zones of differentiated epithelial cells destined to form the inner and outer root sheaths.
根的加粗主要是由于三生结构的分化和发生。
The thickening growth of the root principally results from the differentiation and development of the tertiary structure.
从毛状根上直接分化出不定芽和根。
一年生插条苗的根原基形成时间、部位和分化的过程，以及培土措施对根原基分化的影响。
At the same time the differentiation process of the root primordium, and the effect of hilling up with earth on the process have been carefully followed.
组织病理学检查示肿瘤呈分叶状增生，与表皮相连，主要由向外毛根鞘分化的鳞状上皮组成，周边基底细胞排列成栅栏状。
They were mainly consisted of epithelia differentiated towards cells of the outer root sheath, and the peripheral basal cells of the tumor lobules showed palisading arrangement.
发状根及其愈伤组织轮换在不同组分的培养基上继代培养，对发状根的分化与增殖有明显的促进作用。
It shows obviously active effect on differentiation and multiplication of hairy roots to subculture hairy roots and their calluses on different composition of medium.
伸长的细胞随后开始分化，形成根毛、导管等不同结构，于是植物的根便发育成熟了。
The elongation cell afterwardsstarts to split up, forms the root hair , the drive pipe and so on thedifferent structure, thereupon plant ' s root then grew maturely.
可见，万寿菊外植体在NO和H2O2诱导下，细胞分裂旺盛，为分化的原始组织，并逐渐分化为不定根。
Visible, marigold in explant and H2O2 induction, NO cell division is strong, the original organization for differentiation, and gradually differentiation for adventitious roots.
同时红色愈伤能分化产生红色不定根。
At the same time, the red callus can be divided into red adventitious.
在胚发育和冠状根形成过程中，QHB在根的形态分化之前就已经表达。
During embryogenesis and crown root formation, QHB expression was observed prior to the morphological differentiation of the root.
并对四倍体刺槐无性系试管苗不定根的发育过程进行了解剖观察，结果表明试管苗嫩梢无潜伏根原基，不定根由诱生根原基发育形成，诱生根原基源于髓射线细胞的分裂和分化。
Latent root primordium was not found in shoots in test tubes. The induced root primordium which originated from the division and differentiation of pith ray cell developed into the adventitious roots.
我们推测含有非典型HD的类WUS蛋白可能也参与到水稻根分生组织干细胞的维持与分化过程中。
We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the root apical meristem (RAM) stem cells of rice.
我们推测含有非典型HD的类WUS蛋白可能也参与到水稻根分生组织干细胞的维持与分化过程中。
We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the root apical meristem (RAM) stem cells of rice.
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