这个部分令人奇怪的是这种现象发生在胚胎生命开始后大约六周，也就是这个小身体只有半英寸长的时候。
The amazing thing about this division is that it happens by about the sixth week of embryonic life, when the whole body is only a half inch long.
方法：取5-10周流产人胚胎生殖腺嵴，采用组织块培养法培养人EG细胞。
Methods: Through tissue culture, the human EG cells were obtained by taking the gonadal ridges from human embryos aged 5~10 weeks.
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