May 31, 1972 Dear Marshall, I enjoyed the conversation with you last week. I do hope you can seriously consider presenting a seminar at some time to our laboratory. I would be most happy to make this at any time possible for you. If you prefer we can make this an open seminar or a more informal one, which would be at our usual laboratory group meeting. The latter involves our own lab and Bob Ting's group and some other people at NIH who come fairly regularly. If you do decide that you will be able to do this and would like to make it at our regular lab meeting, they are usually held on Thursdays at 3 p.m. at Litton-Bionetics, Inc., 7300 Pearl Street, Bethesda, Maryland. We could, of course, arrange to pick you up and drive you there. On the other hand, we could obtain a conference room at NIH and make it an open seminar. (My fear of that is that you would bring in all of NIH.) The only time that would be impossible for me would be between June 8 and June 28. Thank you very much, and I hope you will be able to fit this into your schedule. Sincerely, Robert C. Gallo, M.D.