futA and futB genotypes of subisolates after 50 in vitro passages with a small bottleneck.

1fut allele at locus, based on sequencing of 200 bp at the 5�� of gene. The types A and B are referred to the genetic sequence present at the corresponding locus in strain 67:21.2Number of C-residues in 5�� homopolymeric tract and reading frame of the gene (+ in frame, ? out of frame)3Number of C-terminal heptad-repeats