Perhaps it is of some interest that although we parted in the interpretation of the data, many of the data were generated together with Fritz Bach.  And Fritz Bach was an expert... was one of the persons who discovered the MLC reaction, the mixed lymphocyte reaction. And so he was very interested in applying it to the H2 complex and he approached me and we collaborated on many of the projects and then we published several papers together and we remained during that entire period friends.  And so it was a controversy, purely scientific, as I think there should be and that didn't affect the relationship between the people. Later I lost track of Fritz because he went into different areas, but at that period of time, he was then at Wisconsin, it was a busy interaction between the two groups. I was still in Ann Arbor, Michigan and he was, as I said, in Wisconsin so we frequently visited each other and of course we were shipping mice to him all the time. It was a good collaboration actually.