English Name:5-lsothiocyanato fluorescein Molecular Formula:C21H11NO5S Molecular Wt:389.39 Appearance:yellow powder Assay:98.5% Enterprise Standard Usage of FITC: protein fluorescence labeling reagent as well as medical diagnosis drug. Mainly used as fluorescent dyes in fluorescent antibody technique, it combines with many kinds of antibody protein and the combined antibody keeps its antigen binding specificity and has strong green fluorescence in alkaline solution. In medicine, agriculture and livestock breeding, is used for rapid disgnosis of diseases caused by bacteria, viruses and parasites.