My laboratory is interested in the biochemistry and molecular biology of homologous recombination in prokaryotes and eukaryotes. The focus had been on the first homology-dependent step in homologous recombination, the homologous pairing of DNAs. We have been studying the underlying biochemical mechanism to understand the biology of genetic recombination and to devise new strategies to manipulate complex genomes in vitro and, in the future, in vivo, and the DNA-protein complexes involved. In addition, we have been studying the biochemistry and molecular biology of mouse meiosis and evolutionary genomics. Most recently, we have been investigating novel approaches to map recombination hotspots in a variety of mammals including humans.