Whether t cells continue to multiply depends on the action of sensitive receptor proteins on their surfaces.

细胞是否发生持续增殖依赖于它们表面的敏感受体蛋白的活性。

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In the first, the receptor acquired the seven key mutations that made it sensitive to cortisol and not to other hormones.

第一步，受体需要这7个关键点的突变使其能够对皮质醇敏感而不再结合其他激素。

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Over the next 40 million years, the receptor changed shape, so that it became very sensitive to cortisol but could no longer grab other hormones.

后来的4千万年中，这种受体的构想发生改变，变得对皮质醇敏感，而不会结合其他激素。

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