CYT-KF2-LPE is a pre-mixed cocktail of 2 conjugated polyclonal antibodies: Anti-Kappa Light Chains labelled with fluorescein isothiocyanate (FITC) and Anti-Lambda Light Chains labelled with R-phycoerythrin (PE). This reagent is designed for use as a direct immunofluorescence reagent in the identification and enumeration of cells which express Kappa and Lambda immunoglobulin Light Chains by flow cytometry. Antibodies to Kappa and Lambda Light Chains are useful for the identification of clonal excess in B-cell lymphoproliferative disorders together with a panel of other antibodies. Anti-Kappa Light Chains reacts with free Kappa chains as well as Kappa chains in intact immunoglobulin molecules. Anti-Lambda Light Chains reacts with free Lambda Chains as well as Lambda Chains in intact immunoglobulin molecules.