Compartmentalization is one of the main strategies by which nature allows for control over many biological processes. For the proper functioning of living cells, organelles, small compartments within the cell, are essential. Researchers are working on ways to make artificial organelles that add new functionalities to cells or correct dysfunctional processes in cells, for example as a therapy for metabolic diseases. This can be achieved by using synthetic components to produce artificial organelles outside the cell or by using components made in the cell. And it's the latter approach that Suzanne Timmermans explored for her Ph.D. research through the use of protein nanoparticles.