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Multiple sequence alignment of RS27_ARCFU ending S27e with eukaryotic and archaebacterial homologs as detected by a PSI-BLAST search (Altschul et al. 1997). Note that eukaryotic sequences have an amino-terminal extension. The thin black lines at positions 56 and 120 denote the alignment used in the program ConSurf (Armon et al. 2001; Glaser et al. 2003), which maps sequence conservation to the surface of a representative structure (Fig. 5 ▶).
