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.
Determination of copy number and organization of gtrI in wild-type S. flexneri 1a strains. The chromosomal DNA from the strains indicated was digested with EcoRI and HindIII and subjected to Southern hybridization with 32P-labelled gtrI as a probe. The molecular weight marker was EcoRI-digested SPP1 bacteriophage DNA (Progen).
