Nelson A. Wivel, M.D. 
July 15, 1993 
Page Two 
A listing of Biosafety Level 2 practices, containment equipment, and laboratory 
facilities (Section ID), and practices specific for the use of the SFV/Helper 2 Gene 
Expression System (Section IE). 
Please let me know if I can be of further assistance. 
Thank you for your consideration. 
Sincerely yours, 
Director, Corporate Research 
[444] 
Recombinant DNA Research, Volume 18 
