Additional file 6.

Strains present in more than one well (annotated with the letter 'M' in Additional file 3). The well positions are predicted by the smart pooling data. The two wells harboring the same strains are often not immediately adjacent wells, and many of them are not even in the same 96-well plates, suggesting that most of the cross-contaminations probably had happened before we received the library from the supplier. Some of the contaminated wells have been verified by PCR analysis (examples shown in Additional file 7).

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Han et al. Genome Biology 2010 11:R60   doi:10.1186/gb-2010-11-6-r60