Scientists built a system that watches activity across nearly every cell of a living vertebrate at once; transparent zebrafish revealed body-wide signals moving between organs
The system is called WHOLISTIC, short form for Whole Organism Live Imaging System for recording Tissue and IntraCellular activity. The body is never truly quiet. Even when an animal appears to be resting, billions of cells are sending signals, responding to changes and coordinating with organs far beyond their immediate surroundings. For scientists, the challenge…