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.
Maximum-likelihood phylogenetic tree is structured with nifH amino acid sequences in this study. Representative OTU sequences were indicated in boldface. The multi-bar shows the relative abundances of OTU sequences (log10) from different regions. Bootstrap resampling was performed 1000 times and its values higher than 50% are shown.
