![]() Modified nucleotides formerly identified as using plus- syntax (e.g. Deoxy- and ribose nucleotides now have separate chemical definitions with the DNA forms relabeled as DA, DC, DG, DT, DI and DU. Discrimination of DNA and RNA linking nucleotides and modifications.In this and other cases where an atom name has been changed, the previous name is retained in an alternate name in the PDB Chemical Components dictionary. with the exception of the well-established convention for C-terminal atoms OXT and HXT. Atoms names follow the recommendations of described in Pure & Appl. IUPAC nomenclature for standard amino acid and nucleotides.All changes in nomenclature are documented in the electronic chemical components dictionary. Atom and residue nomenclature has been standardized in a variety of ways in PDB version 3.0 data files.
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