Interactions between proteins—the tiny molecules that keep us alive—play a vital role in driving tumor growth, making them important targets for new drugs. However, they’ve been difficult to hit. Alessandra, a physician-scientist in the Sellers Lab, hopes to help solve this challenge by developing a technology that illuminates protein–protein interactions on a single-cell basis. This would allow researchers to identify how proteins engage and communicate with each other much faster and cheaper than current methods, thereby accelerating the pace of new drug discovery.