FIG 1.
Map of the region spanning porU and porV. Numbers below the map refer to kilobase pairs of sequence. The regions of DNA carried by complementation plasmids used in this study are indicated beneath the map.
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.