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.
Comparison of pili expressed in L. pneumophila AA100 and in the pilEL mutant. L. pneumophila wild-type strain AA100 expresses short (A) and long (B) pili. The pilEL mutant strain BS100 expresses only short pili (C). Cosmid pCC3, which contains the pilEL locus, is able to reintroduce expression of long pili to BS100 (D). Pili are indicated by small arrowheads; flagella are indicated by large arrowheads. Bars, 0.5 μm.
