With reference to FIG. 3B. an ??-conotoxin-like conopeptide library can be generated in the fUSE11 vector by using a 5'-phosphorylated bridging oligonucleotide which has the sequence C AGC GGG AGG TGC TGT NNK NNK NNK TGC NNK NNK NNK NNK NNK TGC GGC GGC ATT GAA GGT CGT GGA GCC Seq.ID NO:3! where N is an equimolar mixture of bases G, A, T and C, and K is an equimolar mixture of G and T. The primary