Olli Arjamaa received his Ph.D. in animal physiology@the University of Turku in 1983, and his M.D.@the University of Oulu in 1989 (both in Finland). He is adjunct professor@the Center of Excellence of Evolutionary Genetics and Physiology, Department of Biology, University of Turku. His main research interest is the evolutionary physiology of natriuretic peptides. Address: Department of Biology, 20014 Turun yliopisto, Finland. Email: olli.arjamaa@utu.fi