So I was getting frustrated because I was doing cellular experiments to try to get insight into the molecular mechanisms. Meanwhile, the field of molecular biology had been growing and taking off, and it was becoming more possible to actually study the molecules themselves, to study genes, encoding the molecules, and by studying the genes, get more insight into the molecules. So I decided that I wanted to learn molecular biology — learn the techniques of molecular biology — so I could more directly answer the questions I wanted to address. And for that reason, I went to the laboratory of Richard Axel, who was a molecular biologist at Columbia. I thought this would be much faster to stay there and go to the Axel laboratory than move somewhere else, because I just had to move laterally in the same building. I ended up staying there forever, but that was okay. It was a really good choice.