题目内容

_____________ stem cells are the descendants of totipotent cells and can differentiate into nearly all cells, i.e. cells derived from any of the three germ layers.

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In a developing embryo, stem cells can differentiate into all the specialized cells—ectoderm, endoderm and _____________.

Embryonic stem cells (ESCs) are _______________ and can give rise during development to all derivatives of the three primary germ layers: ectoderm, endoderm, & mesoderm. In other words, they can develop into each of the more than 200 cell types of the adult body.

____________familyproteinsaidinstemcellself-renewalbysupressingtheexpressionofgenesassociatedwithdifferentiation.

There are two mechanisms for stem cells to maintain self-renewal ability: obligatory asymmetric replication and ____________________.