We know specific genes are turned on in specific cells, but we don't know to what extent this happens.

We know specific genes are turned on in specific cells, but we don't know to what extent this happens.

我们知道特定的基因在特定的细胞中被激活，但我们不知道这在多大程度上发生。

-- Walter Gilbert 沃尔特·吉尔伯特