冰冻切片的抗原也在第四周开始出现，定位在卵黄膜及卵壳上。
In the cryostat section, the antigens also appeared at the fourth week, they were localized on vitelline membrane and egg shell.
冰冻切片的抗原也在第四周开始出现，定位在卵黄膜及卵壳上。
In the cryostat section, the antigens also appeared at the fourth week, they were localized on vitelline membrane and egg shell.
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