FIG. 1.

Neighbor-joining tree indicating the phylogenetic relationships of the α- and γ-Proteobacteria isolated from the Muztag Ata ice core and their nearest relatives based on GenBank 16S rRNA sequences. Bootstrap values of >50% (of 100 iterations) were obtained by maximum-parsimony analysis for bootstrap sampling of 100. Scale bars indicate p distances. Additional similar isolates (shown in boldface in parentheses) had the same ARDRA patterns as those sequences of the representative strains, but the 16S rRNA sequences were not determined.