Download Data from FTP Server Coordinate Files na-biol. Coordinate files (PDB format) for one biological unit of nucleic acid-containing structures determined by x-ray crystallography. na-chiral-correct. Coordinate files (PDB format) for the asymmetric unit of nucleic acid-containing structures determined by x-ray crystallography. The chirality has been corrected for these structures. na-mmcif. Coordinate files (mmCIF format) for the asymmetric unit of nucleic acid-containing structures determined by x-ray crystallography in mmCIF format. na-nmr. Copies of the coordinate files released by the PDB for nucleic acid-containing structures determined by NMR. na-nmr-mmcif. Coordinate files (mmCIF format) for nucleic acid-containing structures determined by NMR in mmCIF format. na-obsolete. Coordinate files (PDB format) for structures that have been obsolete or replaced. models. Coordinate files of models in PDB and CIF formats. NDB only. Some structures that are present only in the NDB (and do not have any associated PDB IDs) are currently being remediated. The original version of these files can be found here. Experimental Data structure-factors. Structure factor files in CIF format. nmr-restraints. NMR restraints files in PDB format.