Selenoprotein families we failed to detect because of nonconserved location of stop codons. Selenocysteine residues of Peroxiredoxin-like protein families constitute homologous redox motifs (TXXU and UXXC), but their positions are different between two families. Columns are colored according to sequence conservation. Selenocysteine residues are shown in red, and the other residues in the redox motifs are shown in yellow. Prx; Peroxiredoxin, TPO; thiol:protein disulphide oxidereductase, Adeh; Anaeromyxobacter dehalogenans, Gmet; Geobacter metallireducens, Gsul; G. sulfurreducens, Dpsy; Desulfotalea psychrophila. The alignments were computed using ClustalW, and the figures were generated using Jalview.