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and I'm sure my experience is not unique. I would be tragic if the first human 
tomor virus were identified through the death of some experimenters and their 
f ami lies. 
Good luck on the final stages of the guidelines. I hope it can be done soon. 
Sincerely, 
Harrison Echols, 
Professor of Molecular Biology 
HE/sa 
cc: DeWitt Stetten 
Deputy Director 
of Science 
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