And so what you're looking at here in donor one and donor four, which are the exceptions to the other two, that genes are being turned on in a very specific subset of cells.
所以我们在寻找的是 在捐献者一和捐献者四中， 这两个捐献者的大脑与其他两个不同， 基因在细胞的不同子集中 被打开。