|  |  | 2 hr | 4 hr | 8 hr | 12 hr | 18 hr | 24 hr | 72 hr | 168 hr |
---|---|---|---|---|---|---|---|---|---|---|
Number of differentially expressed genes a | Up-regulated | Total | 68 | 255 | 341 | 218 | 236 | 287 | 267 | 719 |
 |  | With AhR enrichmentb | 55 | 200 | 202 | 148 | 172 | 186 | 164 | 243 |
 |  | With AhR enrichmentb + DRE corec | 47 | 168 | 171 | 126 | 146 | 156 | 135 | 181 |
 | Down-regulated | Total | 18 | 233 | 116 | 168 | 105 | 237 | 261 | 218 |
 |  | With AhR enrichmentb | 10 | 123 | 76 | 102 | 59 | 131 | 137 | 123 |
 |  | With AhR enrichmentb + DRE corec | 6 | 79 | 49 | 63 | 30 | 72 | 79 | 70 |