FIG. 4.
Motility assays. Panel A. Colonies of SS1 luxSwt, X47 luxSwt, or ΔluxS derivatives of these two strains were stabbed once into soft agar and incubated for 4, 7, or 12 days, as indicated on the left. Panel B. Derivatives of strain SS1 ΔluxS used in panel A that had been transformed with DNA containing an erm insertion downstream of either the ΔluxS or luxSwt allele (see Fig. 2, lines C and D) were tested. Two single colonies (sci #1 and sci #2) and also a pool from each transformation (separated by white vertical line) were tested by stabbing in duplicate into soft agar and incubation for 7 days.