FIG. 2.
Production of quorum-sensing regulator HapR in 16 V. cholerae strains. Equal amounts of total protein (10 μg) of late-log cultures were size fractionated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, transferred to a nitrocellulose membrane, and detected with affinity-purified polyclonal anti-HapR rabbit antiserum (23).