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1 can we will go two or three hours, and then we will take 
2 a short break, and reconvene if necessary and go another 
3 couple of hours, if necessary, to finish. 
4 The first speaker is Daniel Nathans. 
5 DR. NATHANS: For the record, I want to summar- 
6 ize my scientific background and interest in relation to 
7 this testimony. I am now Professor of Microbiology and 
3 Chairman of the Department of Micr iobiology at Johns 
g Hopkins University School of Medicine in Baltimore. 
10 I was educated in medicine, specializing in internal 
11 medicine, and subsequently I went into microbiology and 
12 molecular biology. 
13 For the past 16 years I have taught medical 
14 microbiology to students of medicine at Johns Hopkins, 
15 and my research, which has been supported by the 
16 National Cancer Institute and the Whitehall Foundation, 
17 has centered on the molecular biology of tumor viruses. 
13 Part of my research involves recombinant DNA methods to 
19 study aspects of tumor virus interaction with cells. 
20 I was a member of the committee that in 1973 
21 called for NIH guidelines for recombinant DNA research, 
22 and earlier this year I served on the committee that 
23 recommended changes in the guidelines dealing with 
24 viruses. 
25 The main point of my testimony is that the 
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