卵黄原蛋白是昆虫卵黄发生的关键物质。
Vitellogenin is the key factor in vitellogenesis in insects.
卵黄发生直接影响蜱类的繁殖力，一直是蜱类生理学一个十分活跃的研究领域。
The knowledge of reproductive physiology in ticks is very limited as compared to insects.
高浓度雌二醇对卵黄发生前期卵母细胞卵径增大也有明显刺激作用（P＜0．01）；
High concentration of oestradiol had a significant stimulation (P<0. 01) on oocyte diameter increase at the previtellogenesis stage.
蜱类卵黄发生受激素调控，激素的作用与作用激素的种类在硬蜱和软蜱中表现出较大差别。
Vitellogenesis is regulated by hormones. There are obvious differences between hard ticks and soft ticks in hormonal effects and sorts.
卵黄发生前（蛹期）的脂肪体细胞含有大量蛋白颗粒和线粒体，但未见粗面内质网，早期蛹脂肪体细胞中可见多囊泡体；
At previtellogenic stage (that is, at pupal stage), large amounts of protein granules and mitochondria were present in fat body cells, but no rough endoplasmic reticulum (RER) could be observed.
小鼠的造血和血管系统起源于胚外中胚层。胚胎期6.5-7天时在卵黄囊形成特征性的血岛结构发生向造血和内皮细胞的分化。
The hematopoietic and vascular systems of the mouse arise from extraembryonic mesoderm that migrate through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
结论：乙醇可能通过抑制器官发生期脏层卵黄囊的发育诱导胚胎畸形的发生。
CONCLUSION: alcohol exposure in vitro can affect the development of mouse VYS, which may contribute to the teratogenic effect of alcohol.
结论：乙醇可能通过抑制器官发生期脏层卵黄囊的发育诱导胚胎畸形的发生。
CONCLUSION: alcohol exposure in vitro can affect the development of mouse VYS, which may contribute to the teratogenic effect of alcohol.
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