https://www.sgmjournals.org/ijs/content/56/1/65
Molecular evolution of the nif gene cluster carrying nifI1 and nifI2 genes in the Gram-positive...
Jan 1, 2006 - A major nif cluster was detected in the strictly anaerobic, Gram-positive phototrophic bacterium Heliobacterium chlorum .
molecular evolutionof thenif genegram positivecluster