FITC-Dextran (MW 70000) is a compound categorized under fluorescent dyes. It is commonly used as a tracer molecule in biomedical research to label and track cells or other biological substances. Composed of fluorescein isothiocyanate (FITC) and dextran—a complex carbohydrate extracted from starch—this combination forms a stable fluorescent tracer, which can be observed under a microscope or quantified using specialized detection equipment.