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Domain III of selenocysteine-specific translation elongation factor This family represents domain III of bacterial selenocysteine (Sec)-specific elongation factor (EFSec), homologous to domain III of EF-Tu. SelB is a specialized translation elongation factor responsible for the co-translational incorporation of selenocysteine into proteins by recoding of a UGA stop codon in the presence of a downstream mRNA hairpin loop, called Sec insertion sequence (SECIS) element.
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