A microscope picture of human bone cells (U2OS) showing the localization of a lipid (phosphatidylethanolamine). The lipid is visible in orange, the cell membrane in purple, and endosomes in white. Credit: Kristin Böhlig / Nature (2025) / MPI-CBG Lipids are difficult to detect with light microscopy. Using a new chemical labeling strategy, a Dresden-based team led by André Nadler at the Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG) an