SUMMARY: In phase-2 cells of diphasic strains, expression of is repressed by the repressor, coded for by the gene. A procedure for the isolation of operator-constitutive ()mutants of the operon is described. Using three-factor crosses between an strain and strains, where motility recovery via -phase (or phase 1) flagellation was used as the selected marker and the H1-O character was the unselected marker, the relative position of the site to the gene was determined. A diphasic strain produced, in phase 2, copolymer filaments composed of and flagellin.


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