Transposon Tn10 provides a promoter for transcription of adjacent sequences.

Abstract
Promoters located within the transposon Tn10 insertion element cause transcription of host (i.e., Salmonella typhimurium) sequences adjacent to both ends of the inserted Tn10 element. These promoters are usually not observed in genetic experiments because their transcripts are efficiently terminated at nearby .rho.-dependent termination sites. These observations provide an explanation for several confusing aspects of transposon behavior and suggest that many transposons possess promoters that have escaped detection for similar reasons.