胚细胞层

胚细胞随着层积时间的延长不断分裂，顶端分生组织逐渐分化，胚体积增大，由乳白色转为淡绿色，逐渐发育成熟。

Embryonic cell and apical meristems continue to divide as the time of stratification prolongs , so the embryo increases in volume and turns from ivory-white to viridescence , which are the signs of gradually maturing seed .

胚细胞和糊粉层中的代谢活性立即活跃起来。

Metabolic activity quickly develops in the cells of the embryo and the aleurone layer .

胚胎发育到原肠胚时的细胞层，分为内胚层、中胚层、外胚层，各胚层将发育成一定的组织器官。

Germ layer & One of three distinct layers of cells that arise in the inner cell mass , the ectoderm , mesoderm , and endoderm , each of which develops into a distinctly different tissue in the embryo .

鸡胚胎生殖细胞在鼠胚成纤维细胞饲养层上的生长

Growth of Chicken Embryonic Germ Cells on Mice Embryonic Fibroblasts

继代培养时将其置于鼠胚成纤维细胞饲养层上，在含生长因子、分化抑制因子的培养体系中培养胚胎生殖细胞。

For subculture the PGCs were plated with mitotically inactive feeder layer cells of mice embryonic fibroblasts . The medium composed of growth factors and differentiation inhibitory factors .