SELTSelenoprotein T, also known as SELT, is a protein that in humans is encoded by the SELT gene.GeneThe selenocysteine is encoded by the UGA codon that normally signals translation termination. The 3' UTR of selenoprotein genes have a common stem-loop structure, the sec insertion sequence, that is necessary for the recognition of UGA as a Sec codon rather than as a stop signal.Protein structureSelenoprotein T contains a selenocysteine residue at its active site.