Molecular cell biology is a modern and rapidly developing field of science. The Molecular Cell Biology course taught at Semmelweis University has been optimized over many years to meet the needs of future doctors by carefully selecting new knowledge to be incorporated and outdated information to be eliminated. Therefore, it is impossible to find a textbook that covers all the topics of the course. The primary goal of the authors was to help medical and dental students with the most comprehensive and up-to-date teaching material possible. Nevertheless, we believe that this book offers valuable insights to anyone interested in the molecular basis of life.