CUSIP No. 89853L104
Exhibit A
AGREEMENT REGARDING THE JOINT FILING OF
SCHEDULE 13D
The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of each such party.
Date: February 16, 2016
| POLARIS VENTURE PARTNERS V, L.P. | ||
| By: Polaris Venture Management Co. V, L.L.C. | ||
| By: | * | |
| Authorized Signatory | ||
POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND V, L.P. | ||
| By: Polaris Venture Management Co. V, L.L.C. | ||
| By: | * | |
| Authorized Signatory | ||
CUSIP No. 89853L104
POLARIS VENTURE PARTNERS FOUNDERS’ FUND V, L.P. | ||
| By: Polaris Venture Management Co. V, L.L.C. | ||
| By: | * | |
| Authorized Signatory | ||
POLARIS VENTURE PARTNERS SPECIAL FOUNDERS’ FUND V, L.P. | ||
| By: Polaris Venture Management Co. V, L.L.C. | ||
| By: | * | |
| Authorized Signatory | ||
| POLARIS VENTURE MANAGEMENT CO. V, L.L.C. | ||
| By: | * | |
| Authorized Signatory | ||
CUSIP No. 89853L104
| JONATHAN A. FLINT | ||
| By: | * | |
| Jonathan A. Flint | ||
| TERRANCE G. MCGUIRE | ||
| By: | * | |
| Terrance G. McGuire | ||
| ALAN CRANE | ||
| By: | * | |
| Alan Crane | ||
| *By: | /s/ Mary Blair | |
| Name: | Mary Blair | |
| Attorney-in-Fact |
[This Schedule 13D was executed pursuant to a Power of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies.]