Complete genome of the mutualistic, N2-fixing grass endophyte Azoarcus sp. strain BH72.
Occurrence of three PII-like signal transmitter proteins in the diazotrophic proteobacterium Azoarcus sp. BH72.
Role of a ferredoxin gene cotranscribed with the nifHDK operon in N(2) fixation and nitrogenase "switch-off" of Azoarcus sp. strain BH72.