DEPARTMENT OF HEALTH. EDUCATION. AND WELFARE 
PUBLIC HEALTH SERVICE 
NATIONAL INSTITUTES OF HEALTH 
BETMESDA, MARYLAND 20014 
December 18, 1979 
Dr. Donald S. Fredrickson 
Director 
National Institutes of Health 
Building 1 , Room 124 
Bethesda, Maryland 20205 
Dear Dr. Frederickson: 
In response to your invitation of public response concerning 
the downgrading of contaminment requirements for JE. col i K-12 
host vector systems, I strongly support the proposal published on 
page 69218 of the Federal Register, Vol . 44, No. 232. 
Sincerely yours 
Heiner Westphal , M.D. 
Senior Investigator 
Laboratory of Molecular Genetics 
NICHD, National Institutes of Health 
Building 6, Room 338 
Bethesda, Maryland 20205 
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