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.
Amino acid sequence alignment of RexA of B. adolescentis and Rex of B. halodurans. The three catalytic residues (E66, D124, and D259; RexA numbering) are boxed, as is the loop (L312, H313, and P314; RexA numbering) responsible for blocking substrate binding subsite +2 in Rex.
