chap by the nameof Bailey, Donald Bailey, who wasa geneticist, devised a technique for transplanting the skin of mice on their tails. That was nice because it was very easy to read the results of the experiment. He was a worker supported by the Radiological Lab for a numberof years. He and I, I did the radiation and he did the genetics, looked for mutations in the histocompatibility loci. We never found any. When I wentonlater to Harvard and extended these experiments with Melvold, westill never found any. The mutations may not show becausethe cells carrying it do not survive for any great period of time, or they may be shunted aside. Butin anycase,I believe it probably is the only such example. Donald Bailey left UCSF and then went on to a famouslaboratory at Bar Harbor in Maine where he became a senior investigator, and for a while the director of the laboratory. BERGE: Whatpart did radiation play in that? I understood the genetics part. I didn't understand... KOHN: Wetried to induce mutation with X-rays, and we couldn't doit. I believe we,it's been estimated, we tested something like a million and a half irradiated genes. Much of that work was done with Roger Melvold later on at Harvard. Yes, a fellow by the nameof Melvold, that's M-E-L-V-O-L-D, Roger. He's now professor at Northwestern University, Medical School. BERGE: Do you have any other colleagues from that time at UCSF that you want to talk about? KOHN: There was a chap by the nameof Reynold Brown. And he's an important one for you to get hold of. His name do you have it down? R-E-Y- 13