FIG. 1.
cagA variable regions display size variation by PCR. PCR amplification of the 3′ cagA variable regions from Chinese H. pylori strains with primers cag2 and cagA31 is shown. Lane M, size markers (in base pairs).
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.