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| 0000950170-23-002185-index.html | 2023-02-08 16:54:50 | |
| 0000950170-23-002185.txt | 2023-02-08 16:54:50 | |
 0000950170-23-002185-xbrl.zip | 660653 | 2023-02-08 16:54:50 |
| atra-20221231.htm | 4857746 | 2023-02-08 16:54:50 |
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