Exhibit 1
 
Joint Filing Agreement
 
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the common stock of Synthetic Biologics, Inc. and further agree that this Joint Filing Agreement be included as an exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this agreement as of the 3rd day of April, 2019.
 
 
/s/ Randal J. Kirk
 
Randal J. Kirk
     
 
THIRD SECURITY, LLC
     
 
By:
/s/ Randal J. Kirk
   
Randal J. Kirk
   
Manager
     
 
NRM VII HOLDINGS I, LLC
     
 
By:
/s/ Randal J. Kirk
   
Randal J. Kirk
   
Manager
     
 
INTREXON CORPORATION
     
 
By:
/s/ Randal J. Kirk
   
Randal J. Kirk
   
Chief Executive Officer