Smith HO, Gwinn ML, Salzberg SL
DNA uptake signal sequences in naturally transformable bacteria.
Research in microbiology. 1999-11-01; 150.9-10: 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.