One of the currently most expanding and exciting areas in cardiovascular research is the study of receipt and dispatch of chemical signals by different cell types. Major progress has been made during the last years and a number of intercellular mediators have been structurally identified and their regulation studied. The impressive developments in molecular biology have provided most effective tools, enabling us to understand message generation in much more detail than anyone would have appreciated a couple of years ago. These developments also have a major impact on cardiovascular...