因为老鼠在出生时没有髓磷脂损害，我们假设这种蛋白是为了维持髓磷脂的质量，并且在整个生命周期内会逐渐减小。

"Because there is no myelin damage at birth, we assumed prions are needed to maintain the quality of the myelin sheath, which diminishes throughout life," says Aguzzi.

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测试的每种老鼠，不论缺少是哪种菌株，他们发现在出生后六周后出现了髓磷脂损害的现象。

In every mouse they tested, regardless of strain, they found early evidence of myelin damage just six weeks after birth.

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它被称为髓磷脂。

It's called myelin.

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