Duinsbergen, D.

pylori colony res gene c tract variation phase tract transcription phase variation clone strain mod gene transcriptional rt-pcr system expression helicobacter locus transcriptional phase variation helicobacter pylori 5 end restriction region promoter translational sequence fragment mod genes primer transcriptional level level enzyme lacz expression res orf 1 min analysis protein microbiol table slipped-strand mispairing presence length fusion position methyltransferase nucleotide phase-variable bacteriol mispairing rm systems number bacteria genomic mod transcription primers base pair positions sectored genome clone mod 525 translation extension vector 14 cs res 29 mechanism control population primer extension study promoter region slipped-strand restriction enzyme codon rm locus kata gene encoding rt-pcr bands product 2001. 1999.