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.
Phylogenetic tree of Navajo vacAs alleles in Helicobacter pylori sequences. The vacAs1a alleles are shown on the left with two typical vacAs1a strains (26695-NC_000915.1:938415-942287 and AR-710-AY185128.1). Sequences shown on the right display vacAs1b alleles with reference strains (USA2754-AB057223.1, 60190-U05676.1 and J99-NC 000921.1). The vacAs2 allele is shown on the top with a representative strain (Tx30a-U29401.1) in this group.
