abstract |
Methods of enriching a subpopulation of beads are described. In one embodiment, first beads comprise immobilized first amplified product, said first amplified product encoding a truncated version of a first protein, and second beads comprise immobilized second amplified product, said second amplified product encoding an untruncated version of said first protein. Both first and second beads are exposed to a translation system under conditions such that said truncated and untruncated versions of said first protein are generated from at least a portion of said first and second immobilized amplified products, and these protein products are captured on the first and second beads, respectively. Using a ligand (e.g. with affinity for the untruncated version of said first protein), a portion of the second beads is separated from the mixture, thereby enriching a subpopulation of beads comprising truncated protein. |