Abstract: An in vitro method for constructing an oligonucleotide concatamer library is revealed. The method has four steps. The first step involves the generation of a primer-bridged circular template oligonucleotide. In the second step, the primer-bridged circular template is used to generate a single-stranded oligonucleotide concatamer by rolling circle replication. In the third step, the single-stranded oligonucleotide concatamer is converted to a double-stranded oligonucleotide concatamer. Finally, the double-stranded oligonucleotide concatamer is cloned or used directly in in vitro assays which allow molecules of interest to be isolated or amplified.

Abstract: The present invention is directed to modified proteins and methods of their production. The modified proteins comprise a controllable intervening protein sequence (CIVPS) inserted into a target protein, the CIVPS being capable of excision from the modified protein under predetermined conditions, i.e., increase in temperature, exposure to light, unblocking of amino acid residues by dephosphorylation or deglycosylation. If desired, the modified protein can be subjected to these conditions. The CIVPS may also be inserted into a region that substantially inactivates target protein activity.