Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Formation of phase-refractile spores by wild-type SM101, the sigF- and sigG-null mutants, and complementing strains. Shown are results for DS cultures of each strain after 8 h of growth at 37°C in DS. Photographs were taken using a phase-contrast microscope (magnification, ×1,000).
