FITC-Dextran (MW 20000) is a compound classified as a fluorescent dye. It is commonly used as a tracer molecule in biomedical research to label and track cells or other biological materials. This compound is a combination of fluorescein isothiocyanate (FITC) and dextran, where dextran is a complex carbohydrate derived from starch. The combination results in a stable fluorescent tracer, observable under a microscope or quantifiable with specialized detection instruments.