Enumerations for _Sample_component.Isotopic_labeling (An open enumeration)
`[95% 13CA]-Trp` | 'All Trp residues labeled 95 percent with 13C in the CA position'
`natural abundance` | enumeration_text
`[U-100% 13C]` | enumeration_text
`[U-100% 13C; U-100% 15N]` | enumeration_text
`[U-100% 13C; U-100% 15N; U-80% 2H]` | enumeration_text
`[U-100% 15N]` | enumeration_text
`[U-100% 2H]` | enumeration_text
`[U-10% 13C]` | 'Uniformly labeled with 13C at a level of 10 percent'
`[U-10% 13C; U-100% 15N]` | enumeration_text
`[U-10% 13C; U-99% 15N]` | enumeration_text
`[U-13C]` | 'Uniformly labeled with 13C at an unknown percentage'
`[U-13C; U-15N]` | 'Uniformly labeled with 13C and 15N at unknown percentages'
`[U-13C; U-15N]-Ade` | 'All adenine nucleotides labeled fully with both 13C and 15N'
`[U-13C; U-15N]-Cyt` | 'All cytosine nucleotides labeled fully with both 13C and 15N'
`[U-13C; U-15N]-Gua` | 'All guanine nucleotides labeled fully with both 13C and 15N'
`[U-13C; U-15N; U-2H]` | 'Uniformly labeled with 13C, 15N, and 2H at unknown percentages'
`[U-13C; U-15N]-Ura` | 'All uracil nucleotides labeled fully with both 13C and 15N'
`[U-15N]` | 'Uniformly labeled with 15N at an unknown percentage'
`[U-15N]-Leu` | 'Uniformly labeled 15N Leu residues'
`[U-2H]` | enumeration_text
`[U-90% 15N]` | enumeration_text
`[U-95% 13C]` | enumeration_text
`[U-95% 13C; U-90% 15N]` | enumeration_text
`[U-95% 13C; U-95% 15N]` | enumeration_text
`[U-95% 15N]` | enumeration_text
`[U-98% 13C; U-98% 15N]` | enumeration_text
`[U-98% 15N]` | enumeration_text
`[U-99% 13C; U-99% 15N]` | 'Uniformly labeled with 13C at 99 percent and 15N at 99 percent'
`[U-99% 15N]` | 'Uniformly labeled with 15N at a level of 99 percent'
`[U-99% 2H]` | enumeration_text