Philip Lawley, who was a chemist at the Chester Beatty Research Institute in the UK, has died, reports Nature. Lawley studied how mutagens and carcinogens bind to and affect DNA, and was among the first to link DNA damage to cancer. Lawley and Peter Brookes, his colleague at Chester Beatty, which is now the Institute of Cancer Research, reported that mustard gas forms adducts with guanine in DNA, and those adducts then affect DNA replication and cell division.