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 NifH sequences from MAGs (a) and comparison of the nif operon from SZUA-77, the closest nif operon in NCBI, and the nif operons of representative Nitrospirae diazotrophs (b). The scale bar in the phylogenetic trees represents 0.1 amino acid substitutions per sequence position. The information of reference NifH sequences used in the phylogeny is in Table S6
