胚胎发育
Animal cells lose their totipotency at an early stage in embryonic development.
动物细胞在胚胎发育的较早阶段便失去了其全能性。
Humans are asymmetric animals. Early in our embryonic development, the heart turns to the left. The liver develops on the right. The left and right lungs have distinct structure.
人类是不对称的动物，在我们胚胎发育的早期，心脏就转向了左边，肺则往右长，而且左、右肺具有完全不同的结构。
The results not only provide evidences for the study of early embryonic development mechanism in silkworm, but also give clues for the study of insects diversity.
这一结果不但可以为家蚕胚胎发育调控机制的分子水平研究提供重要参考，也可为昆虫分化多样性的分了机制研究提供线索。
Pregnancy is a complicated process, it contains the early implantation of blastocyst and the embryonic development.
妊娠是一个复杂的过程，包括早期的胚胎着床及其之后的胚胎发育。
ADH isozyme was expressed in all stages of embryonic development, but there were differences in enzyme bands and enzyme activities.
醇脱氢酶同工酶在中华绒螯蟹胚胎发育的各阶段均有表达，但表达的酶带数和活性有区别；
Meanwhile the abnormal phenomena from fertilized eggs division, organ forming to hatched larva during each embryonic development stage of hybrid were observed. The malformation rate was 51.8%.
同时，观察了杂种胚胎发育各时期中自卵裂、囊胚、原肠作用、器官形成至孵出期的发育异常现象，畸形率为51.8%。
An intact death pathway is required for successful embryonic development and the maintenance of normal tissue homeostasis.
细胞死亡通路对于胚胎发育和正常组织稳态的维持是必需的。
The paper deals with the relationships between ambient temperature and speed of embryonic development, death rate , speed of increase of Hynobius leechii.
本文初步研究了环境温度与东北小鲵胚胎发育速度。 胚长增长速度、死亡率之间的关系。
To start out I'm going to go back to the thinking about development a little bit, embryonic development, and show you a picture here.
作为这节课的开始，我先稍微回顾一下，一些关于发育过程的内容，先说胚胎发育，这里有张图。
There are so many important genes on every chromosome that the loss of both members of a homologous pair would be fatal, wouldn’t even get past embryonic development.
每一条染色体上都包含了数量巨大的重要基因，而同时丢失一对同源染色体将是致命的，生命甚至通不过胚胎发育期。
Human brain plays a crucial role in the life of individual, from embryonic development to growth, maturation and aging.
从胚胎发育到个体生长、成熟、衰老的整个生命过程中，脑组织始终发挥着十分重要的作用。
Human brain plays a crucial role in the whole course of an individual's life, from embryonic development to growth, maturation and aging.
从胚胎发育到个体生长、成熟、衰老的整个生命过程中，人脑始终发挥十分重要的作用。
Much of this process happens during a surprisingly short time and at very early stages of embryonic development.
在胚胎发育的很早期阶段，多数步骤都会在一个极短的时间内发生。
The research greatly expanded knowledge about embryonic development as well as aging and disease.
该项研究大大扩展了我们对于胚胎发育以及衰老和疾病的认识。
Effects of light rhythm and light intensity on hatching rate and deforming rate of larvae were not remarkable, but they all delayed or accelerated the embryonic development speed.
不同的光照节律和光照强度对胚胎的孵化率和初孵仔鱼畸形率影响不大，但是对胚胎发育速率和孵化时间具有明显的延滞或促进作用。
Homeobox gene is a sort of regulatory gene which controls embryonic development and cellular differentiation.
同源框基因是一类控制胚胎发育和细胞分化的调节基因。
Any of a group of vertebrates that have an amnion during embryonic development, including reptiles, birds, and mammals.
脊椎动物，羊膜动物：任一种在胚胎发育期间有羊膜的脊椎动物，包括爬行动物、鸟类和哺乳动物。
Objective To investigate the effects of ofloxacin on mouse embryonic development and to determine wether ofloxacin is of reproductive and teratogenic toxicity.
目的研究氧氟沙星对昆明系小鼠胚胎和胎鼠发育的影响，确定其是否存在生殖毒性和致畸性。
VEGF is essential for embryonic development, endochondral bone formation, female reproductive functions. Substantial evidence also implicates VEGF in tumor and intraocular angiogenesis.
VEGF也是胚胎发育、软骨内骨形成、女性生殖系统、以及肿瘤和眼球内血管新生所必需的。
Investigation the expression patterns of HAT1 in oocytes maturation and early embryonic development process is of great significance in understanding the genesis of early animals.
因此，研究卵母细胞成熟过程及早期胚胎发育过程中HAT1基因的表达模式，对深入了解动物个体的发生机理具有重要意义。
The experiment brought up interests of students about the biological experiment and enhanced the understanding of the process of animal embryonic development.
该实验有利于培养学生对生物学实验的兴趣，加深对动物胚胎发育过程的了解。
Fertility and early embryonic development have been investigated in rats and embryo-fetal development has been investigated in rats and rabbits.
研究大鼠的生殖能力和早期的胚胎发育以及大鼠和兔子的胚胎-胎仔发育。
Embryo bisection is a powerful means in the study of cell differentiation, early embryonic development and the totipotency of embryo cell.
胚胎分割是研究细胞分化、早期胚胎发育、胚胎细胞全能性的有力手段。
|fetation;胚胎发育
胚胎发育（Embryonic Development）是指从受精卵形成开始，到主要器官系统基本建立完成的整个早期发育过程。这是多细胞生物体生命周期的关键起始阶段，为后续的生长和分化奠定基础。其核心过程包括：
调控机制：胚胎发育受到极其精密的调控：
研究意义：理解胚胎发育对于认识生命起源、先天性畸形成因、干细胞分化与再生医学、进化生物学等至关重要。
人类胚胎发育时间框架：在人类中，胚胎期特指受精后的前8周（孕龄10周），此期结束时，所有主要器官系统的雏形均已建立，胎儿期随之开始。
权威参考资料：
Embryonic development（胚胎发育）是指从受精卵形成到胚胎器官系统基本建立的全过程，是生物体早期发育的核心阶段。以下是关键要点：
基本定义 胚胎发育始于受精卵（zygote），经历细胞分裂、分化和组织构建，最终形成具备各器官系统的幼体。在人类中，这一过程通常指受孕后前8周（胚胎期）。
核心阶段
该过程在不同物种中具有保守性（如果蝇与人类共享部分发育基因），但具体形态变化差异显著。更详细的发育生物学原理可参考《发育生物学》教材或专业文献。
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