XmlmmCIF equivalent: pdbx_nmr_sample_details Complete description of each NMR sample, including the solvent system used. XmlmmCIF equivalent: pdbx_nmr_sample_details/contents A complete description of each NMR sample. Include the concentration and concentration units for each component (include buffers, etc.). For each component describe the isotopic composition, including the % labeling level, if known. For example: 1. Uniform (random) labeling with 15N: U-15N 2. Uniform (random) labeling with 13C, 15N at known labeling levels: U-95% 13C;U-98% 15N 3. Residue selective labeling: U-95% 15N-Thymine 4. Site specific labeling: 95% 13C-Ala18, 5. Natural abundance labeling in an otherwise uniformly labeled biomolecule is designated by NA: U-13C; NA-K,H XmlmmCIF equivalent: pdbx_nmr_sample_details/solvent_system The solvent system used for this sample. XmlmmCIF equivalent: pdbx_nmr_sample_details/solution_id The name (number) of the sample.