University College London May 13 2025 Researchers at UCL and the Francis Crick Institute have, for the first time, identified the origin of cardiac cells using 3D images of a heart forming in real-time, inside a living mouse embryo. For the study, published in The EMBO Journal, the team used a technique called advanced light-sheet microscopy on a specially engineered mouse model. This is a method where a thin sheet of light is used to illuminate and take detailed pictures of tiny samples,