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Relative proportions of the three species of 13C-enriched Ser after treatment with methotrexate (100 μm) plus sulfanilamide (2 mm)
| Time | [α,β-13C]Ser | [β-13C]Ser | [α-13C]Ser |
|---|---|---|---|
| h | % | ||
| 0 | 64 ± 10 | 12 ± 4 | 24 ± 6 |
| 24 | 57 ± 8 | 13 ± 5 | 30 ± 6 |
| 48 | 46 ± 6 | 16 ± 3 | 38 ± 4 |
The data are expressed as the percentage of total 13C-enriched Ser and the experimental details are as described for Figure 5. There are no data for 96 h because the [13C]Ser signal was not distinguishable from the baseline noise.
