Dr. Donald S. Frederickson 
August 12, 1974 
Page 2 
The Proposed Revised Guidlines express a welcome reassessment 
of the safety of recombinant DNA-carrying organisms. I hope we can 
continue to respond to lessons based on accumulating experience in 
aiming for efficient and effective levels of regulation or lack 
thereof. 
Yours faithfully, 
Dana Carroll 
Assistant Professor 
Department of Microbiology 
DC/bjp 
[A-ll] 
