Screening a plasmid library to recover a cloned gene.

  1. Colonies of a plasmid library is overlaid with a DNA binding filter.

  2. Colonies are transferred to the filter, then lysed, and DNA is denatured.

  3. Filter is placed in a bag with a solution containing a radioactively labeled single-stranded DNA probe; the probe hybridizes with complementary DNA on the filter.

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