(a) 90A cohort
| Feature type | 90A cohort | 91A cohort | 181A cohort |
|---|---|---|---|
| I | 0 | 0 | 0 |
| II | 48 | 0 | 48 |
| III | 1 | 1 | 0 |
| IV | 82 | 0 | 0 |
|
| |||
| Total # probes | 131 | 1 | 48 |
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