Fig. 2.

Unrooted phylogenetic tree showing the distance between AFR (gene locus PF1190) and its homologs in relation to ferritins and rubrerythrins. The sequence of P. furiosus AFR was compared with all sequences in the data bank using a BLAST search. Sequences with more that 30 % identity were used for multiple alignment with the sequence of ferritins, bacterioferritins, and rubrerythrins. The multiple sequence alignment and the phylogenetic tree were produced using the Phylip resource (http://bioweb.pasteur.fr)