以下为句子列表：
英文: However, depending on the differences among E.coli strains, and the procedures used to extract and purify endotoxin that serves as standard for these measurements, some differences might occur in the specific activity.
中文: 然而，依靠大肠杆菌张力的不同，用这些测量法的标准，过程中曾经析取和净化内毒素，一些不同的力量存在比活性。
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