(b) 181A cohort
| Feature type | 90A cohort | 91A cohort | 181A cohort |
|---|---|---|---|
| I | 2 | 2 | 2 |
| II | 140 | 0 | 140 |
| III | 0 | 14 | 14 |
| IV | 0 | 0 | 146 |
|
| |||
| Total # probes | 142 | 16 | 302 |
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