Abstract
Since the discovery of selenocysteine, considered as the 21th amino acid, investigation about this issue has gone in depth due to the improvement of the selenoprotein knowledge. Several selenoproteins have been identified in mammals, insects and protists. Our project focuses on the identification of the T, V and W families in different protists genomes. Computer programs as BLAST, Exonerate, T-Coffee or SECISearch have been used in order to predict these genes in the selected protists genomes. Not only homologous with cysteine, but also homologous in selenocysteine have been found. Referring to the last ones, just in some of them the SECIS element has been identified. A better assembly of the protists genomes would make this research a more accurate task; moreover, using queries from phylogenetically nearer protists would offer more exact results.