The drug is derived from the bark of the cinchona tree, native to South America, and by 1856 demand for the drug was surpassing the available supply.

这种药物是从原产于南美洲的金鸡纳树的树皮中提取的。到了1856年，对这种药物的需求已经超过了现有的供应。

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Starting about a week before the transplant, the patients also received a drug called alemtuzumab which destroyed circulating native white blood cells so they couldn't attack the transplanted cells.

移植前一周，患者授受一种称为阿仑单抗的药。该药破坏循环中的自然白细胞，使之丧失攻击移植细胞能力。

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Starting about a week before the transplant, the patients also received a drug called alemtuzumab which destroyed circulating native white blood cells so they couldn't attack the transplanted cells.

移植前一周，患者授受一种称为阿仑单抗的药。该药破坏循环中的自然白细胞，使之丧失攻击移植细胞能力。

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