The second facility had an even greater impact on me. It was, for reasons unknown to me, a gentleman from a major pharmaceutical company established a laboratory on one of the remaining floors of the Wistar Institute, and I think it was also on the floor occupied by Farris but on the opposite end of the building, so they were quite distant, and that fellow was a virologist. This was my first contact with people in virology. It also attracted two or three of my friends at the University of Pennsylvania who became graduate students in that facility. And because they were so close to me physically, and also as friends, I visited them frequently, and I learned... and what they had also there was a cell culture facility, and they were culturing cells in fermentation tanks, the first time I had ever seen this done, and I believe they were pretty much the first people to grow cells in fermentation tanks, which was a very fascinating thing to see – to grow human and animal cells in large tanks, and then to retrieve the cells and do various studies with them, with the viruses, was... was again a very exciting experience. So my interests were continuing to develop in those directions as well. There were other events that occurred in respect of, kind of, cell culture works that they were doing that also had some influence on my thinking.