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DR. FREDRICKSON: Dr. Chilton, you have no more comments here? 
DR. CHILTON: Well, I did have one comment. 
DR. FREDRICKSON: Would you stand up, please, at the podium? 
DR. CHILTON: As I read this it says that the cloning of plant viruses 
is P3+EKI or P2+EK2 at the investigator's choice, as I understand it. 
DR. MOLINA: There is also a matter in this orange set of documents, I 
guess. It is document 28, which I believe raises the same question. A less 
liberal interpretation leads you to a different understanding of what is 
meant. So I think that needs some sort of clarification. 
DR. FREDRICKSON: It is clear that it does need clarification. We will 
have to consult further with the Committee and with other outside experts. 
We have had a small subgroup which contains ad hoc additions to it with- 
in the Recombinant Advisory Committee from time to time on plants. We have 
the National Science Foundation and the Department of Agriculture who had a 
recent meeting and made recommendations directly to the RAC so that there 
certainly is less activity, less certainty in many of our minds about these 
guidelines for plants. But we are attempting to mobilize the maximum of ex- 
pertise, and to move cautiously, as always, but forward in developing these 
systems for plants as well as for animals. But I agree with you that the 
comments leave uncertainties, that to a certain extent I think suffer from 
Dr. Day's sudden illness, because he was prepared. We had him primed to take 
up a number of these particular issues. It wouldn't be fair to expect Dr. 
Zaitlin to have picked that up so rapidly. 
Dr. Vidaver. 
DR. VIDAVER: You have indicated that the CDC classification is in con- 
sideration of being revised, and I wonder if some of the questions that might 
arise with plant microorganisms might be clarified by making a provision for 
including representation in whatever avenue is appropriate for this revision. 
DR. FREDRICKSON: Yes, I think that is a splendid suggestion, and it is 
entirely possible. 
Let us go on, then. We have a few more invited witnesses, two more, 
actually, and then some public witnesses on this subject. 
Dr. Bock. You were scheduled. Did you wish to present at this time on 
experimental guidelines? 
DR. BOCK: I had a number of comments conveyed to me by scientists who 
were concerned that the thinking in the Guidelines concerning plants were at 
an early stage of development, and needed input from plant scientists so that 
one could see the range of experiments between symbionts and plants, plant 
cells in culture, which can now be handled in culture and cultivated 
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