Smith, H. O., Gwinn, M. L., Salzberg, S. L.
DNA Uptake Signal Sequences In Naturally Transformable Bacteria
Res Microbiol. 1999 Nov 01; 150(9): 603-16.
The naturally transformable bacterium Haemophilus influenzae Rd contains 1471 copies of the DNA uptake signal sequence (USS) 5'-AAGTGCGGT in its genome. Neisseria meningitidis contains 1891 copies of the USS sequence 5'-GCCGTCTGAA. The USSs are often found in the base paired stem of transcription terminators.