Leukemia cells to chemotherapy is tolerance. Toxicology own cells to the rejection mechanism will be activated once the effects of chemotherapy drugs on leukemia cells.

白血病细胞对化疗是有耐受性的，细胞本身对毒物的排异机制一旦启动将会影响化疗药物对白血病细胞的作用。

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Toxicology curriculums concentrate on the study of drug interactions on biological systems and organisms and the sources. chemical properties. biological effects. and therapeutic uses of drugs.

毒理学主要研究生物系统，生物，来源，化学性质，生物效应，治疗用途之间的相互作用。

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For drugs and biologics, the focus of animal testing is on the drug's nature, chemistry, and effects (pharmacology) and on its potential damage to the body (toxicology).

在药物及生物制品方面，动物实验重点研究它们的基本性质，化学性质和药效(药理)以及其可能对机体造成的潜在的伤害(毒性)。

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The medical examiner didn't find any evidence of "natural disease except for a slightly enlarged heart, " nor did toxicology tests reveal signs of drugs or alcohol.

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It is not known if Harris actually took the medication, and investigators said Wednesday early toxicology tests performed by the medical examiner's office showed no evidence of drugs or alcohol in the body of either gunman, Harris or Dylan Klebold.

CNN: Columbine shooter was prescribed anti-depressant