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This question already has an answer here:

What steps should be taken in a molecular lab environment to help ensure that DNA samples/stocks are not contaminated, or contaminate other objects in the lab?

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marked as duplicate by March Ho, Chris♦, fileunderwater, The Last Word, AliceD♦ Jun 8 '15 at 11:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ VTC because this question is identical to the later one, and the later one is better asked and has better answers. $\endgroup$ – March Ho Jun 8 '15 at 4:41
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From the comment section:

Mostly segregation of PCR-amplified DNA from non-amplified DNA. Typically no DNA or sample should ever enter a specific room designed to prepare the MasterMix for PCR (this is true for diagnostic labs, in the research one I never saw that). For the rest, following good laboratory practices (google that) should be enough.

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