The cell differentiation is not the result of the action of a single factor but of the interaction and counteraction of the action system among the gene, cytoplasm and extracellular environment.

但是，细胞分化并非单一因素作用的结果，而是基因、细胞质及细胞外环境作用系统相互作用与反作用的结果。

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She said they were currently funding research into drugs that mimic the action of nerve growth factor (NGF), the name given to the gene therapy involving stimulating cell function.

BBC: NEWS | Health | Alzheimer's gene therapy hailed