Fig. 1.

Phylogenetic relationships among cyanobacterial 16S rRNA phylotypes recovered from Atacama hypoliths. Phylotypes recovered during this study are shown in bold type. Phylotypes indicated by an asterisk share >97% sequence similarity with their most closely affiliated phylotype indicated by a NCBI GenBank accession number (in brackets) on the tree. NCBI GenBank accession tree topologies are supported by Bayesian posterior probabilities (first number) and bootstrap values for 1,000 replications (second number). Scale bar 0.1 nucleotide changes per position