Parent Directory| Name | Size | Last Modified |
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| 0001564590-14-005468-index.html | 2014-11-12 07:00:20 | |
| 0001564590-14-005468.txt | 2014-11-12 07:00:20 | |
| atra-8k_20141112.htm | 26456 | 2014-11-12 07:00:20 |
| atra-ex991_201411126.htm | 234861 | 2014-11-12 07:00:20 |