As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
Biosynthesis and properties of selenocysteine - 21st amino acid of the diverse genetic code are discussed.New structural pecularities of Sec-tRNA ser as mRNA are crucial for incorporation of selenocysteine into some proteins.Pseudoknot structure can be formed within mRNA and play a regulatory role in translation.