We use bookmarks to mark places in a book we want to read. In the bodies of humans and other mammals, chemical markers determine which gene segments are read for the production of proteins. These so-called epigenetic markers control which information is used and how a cell develops. The Freiburg pharmaceutical researcher Prof. Dr. Manfred Jung and his team are searching for substances that act on these chemical markers, for instance removing them. In this way, they aim to inhibit the growth of cancer cells and prevent the spread of diseases like malaria.