Parent Directory| Name | Size | Last Modified |
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| 0001564590-19-017589-index.html | 2019-05-09 08:10:29 | |
| 0001564590-19-017589.txt | 2019-05-09 08:10:29 | |
| atra-8k_20190509.htm | 35576 | 2019-05-09 08:10:29 |
| atra-ex991_6.htm | 124879 | 2019-05-09 08:10:29 |