-3- 
DNA developments for which we lack sufficient information to 
substantiate or refute our concerns. Therefore, we hope that 
further risk assessment research of an expanded nature will be 
undertaken; we are eager to work with you and other agencies 
in developing a strategy; and we support an annual review of 
the progress made in the area of risk assessment work. 
Sincerely yours, 
Courtney Riordan, Ph.D. 
Acting Assistant Administrator 
for Research and Development 
y 
John A. Todhunter, Ph.D, 
Assistant Administrator 
for Pesticides 
and Toxic Substances 
cc : 
TS-788 (2) 
RD-672 
[ 614 ] 
