When DNA is damaged the consequence can be mutation which can drive cancer. Fortunately, our cells have repair mechanisms that can fix damage in order to protect the cell. KJ Patel’s group in the LMB’s PNAC Division studies these cellular processes by deleting a target gene to reveal its role in repair; if a gene is needed for repair, the cells will form fewer colonies. On Day 12 of #LMB365 we show towers of plates containing such colonies before they are counted by a project student from Cambridge University @Cambridge_Uni