Or. Donald S. Fredrickson 
page 2 
18 November 1977 
would restore containment to P2 +* EK2 for shotgun experiments, the level that 
obtains at the present time and which is also required for plant virus DNA. 
Sincerely, 
f / 
l.tU 
,Y 
Peter R. Day, Head 
Department of Genetics- 
PRD/ebb 
[Appendix A — 77] 
