Scientists analysed thousands of immune cells from ordinary blood samples without adding dyes; their imaging method identified activated cells with nearly 94% accuracy within 2 hours

• Representative Image (AI-generated)A routine blood sample contains a surprisingly detailed record of what the immune system is doing.
• Scientists have now demonstrated a way to read some of that information without adding fluorescent dyes or other chemical labels.
• The approach examines the natural light emitted by molecules inside immune cells, allowing researchers to assess their metabolism at the single-cell level.