Nies B A, Meyer J F, Wiedemann B
J Gen Microbiol. 1985 Sep;131(9):2443-7. doi: 10.1099/00221287-131-9-2443.
The tetracycline resistance region of the multi-resistance plasmid pBP16 is flanked by direct repeats of the insertion sequence IS160. The tetracycline resistance region plus the flanking IS elements can transpose as a discrete unit. The composite transposon, designated Tn2440, has a size of 4.0 kb.