Fig. 2.

Phylogenetic tree of 129 representative microbial isolates obtained from the deep-sea hydrothermal sources. The phylogenetic tree, based on 16S rRNA genes of isolates deposited in the NCBI taxonomy database, is constructed by phyloT and visualized by iTOL. The inner color-coded circle indicates the phylum to which the isolate belongs; symbols outside the inner ring indicate the matrix from which the isolate was obtained; the outer circle indicates the optimal growth temperature of the isolates. Opt T, optimal growth temperature