Fig. 8

Taxonomic classification of archaeal 16S rRNA sequences in anode biofilms of the MFCs at the order level (a) and the genus level b. *Represents Methanomassiliicoccus with a similarity rate of 90% compared with Methanomassiliicoccus luminyensis strain B10 as based on BLAST analysis utilizing the National Center for Biotechnology Information (NCBI) database