Fig. 4.

Minimum evolution tree of 16S rRNA sequences and intron sequences. (a) Based on logdet distances estimated from 16S rRNA from all Thermotogales strains included in the study, rooted by Aquifex aeolicus.(b) Based on Kimura 2P distances estimated from 16S rRNA from the strains most closely related to T. neapolitana NS-E. (c) Based on Kimura 2P distances estimated from the intron sequences from E. coli position 1931. All trees were estimated in paup* (19) by using 10 random stepwise additions and TBR branch swapping. Numbers on nodes indicate number of times the node was recovered in 100 bootstrap replicates. Presence of a group I intron in the 23S rRNA is indicated in a and b.