Protein products have now been identified which account for the entire coding capacity of the transposable element Tn3. Mutations in Tn3 have allowed us to map the genes encoding each of these peptides and to identify their role in transposition. We have found that only a single Tn3-encoded peptide is required for transposition. Expression of this peptide is repressed by the product of a second gene, which is itself autogenously regulated.
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