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.
Expression of all four cfa genes is essential for CFA/I pilus production. (A) Negative-control strain MC4100, which lacks the cfa genes, does not express pili on the cell surface. (B) Positive-control strain MC4100/pGU1/pGU2 (cfaABCE) produces CFA/I pili. (C) Test strain MC4100/pGU1/pHSG576 (cfaABC) fails to produce pili.
