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.
Alignment of the sequences of 32 IBV strains surrounding the epitope-coding region on the S1 protein. The GenBank accession numbers of the IBV strains used are indicated in parentheses. The genotypes of the viruses were listed on the left side.
