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| Mean contribution ± SD | Min | Max | |
|---|---|---|---|
| Unknown 1 | 6 ± 3 | 2 | 16 |
| Tryptophan | 18 ± 8 | 3 | 42 |
| Indoxyl sulfate | 35 ± 11 | 5 | 57 |
| Indoleacetyl glutamine | 2 ± 2 | 0 | 8 |
| Indoleacetic acid | 4 ± 4 | 1 | 31 |
| All Other | 31 ± 11 | 10 | 90 |
