Optimal levels range from 30 nanograms per milliliter to 40 nanograms per milliliter, the researchers said.

研究人员说，最佳水平范围是每毫升30到40纳克。

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When they found the treated mice were able to withstand that dose, they continued to raise it until they reached 125 nanograms, and the mice still withstood it.

当他们发现治疗后的小鼠能够耐受住这个剂量时，他们不断提高剂量直到达到125纳克，而小鼠仍然能够承受。

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When they found the treated mice were able to withstand that dose, they continued to raise it until they reached 125 nanograms, and the mice still withstood it.

当他们发现治疗后的小鼠能够耐受住这个剂量时，他们不断提高剂量直到达到125纳克，而小鼠仍然能够承受。

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