实验动物 动物病毒 鸡胚 多种细胞培养 Amniotic cavity Yolk snc Albun Figure 6.21 (o) A technician inoculates fertilized chicken egg with viruses in the first stage of preparing vaccines. This process require avity. a fluid-filled sac that functions in embryonic waste removal: fe amniotic cavity. a sac that cushions and protects the embryo itself: the chorioallantoic membrane, which funetions in embryonic gas exchange: the yolk sac, a membrane that mobilizes yolk for the nourishment of the embryo: and the embryo itself.动物病毒 实验动物 鸡胚 多种细胞培养