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.
Alignments of conserved domains found in NarB, NirA, and NrtP from Synechococcus sp. strain WH8103. Conserved residues are highlighted in boldface type; those (cysteine) conserved residues that are involved in cofactor binding are underlined. X, any amino acid.
