How do cells remember what type of cell they are even though most cells in our body contain the same genetic information? Renato studies Polycomb group and Trithorax group proteins, which act as a memory aid to cells by switching genes on and off. Renato would like to see his work on ‘cellular memory’ be put to use in making cells forget their identity and then learning a new one. Perhaps heart cells could one day be grown from another cell type for use in therapy after a heart attack.