求翻译：of purified bacterial DNA and 5 cfu of bacteria added to milk or phosphate buffered saline. Following overnight growth of bacteria是什么意思？

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of purified bacterial DNA and 5 cfu of bacteria added to milk or phosphate buffered saline. Following overnight growth of bacteria

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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