“封装能保护细胞免遭免疫系统攻击，并且会含有畸胎瘤细胞。” Weir 说。

"Encapsulation protects cells from getting killed by the immune system and would contain teratoma cells," says Weir.

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它还保护我们免受病毒和自身免疫性疾病的侵害。

It also protects us from viruses and from autoimmune diseases.

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而较年轻的人则无此种免疫保护。

Younger people, however, had no such protective immunity.

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