Parent Directory| Name | Size | Last Modified |
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| 0001564590-17-015973-index.html | 2017-08-07 16:05:28 | |
| 0001564590-17-015973.txt | 2017-08-07 16:05:28 | |
| atra-8k_20170807.htm | 31959 | 2017-08-07 16:05:28 |
| atra-ex991_15.htm | 135896 | 2017-08-07 16:05:28 |