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Because of their unique carbohydrate binding characteristics, lectins serve as invaluable tools in biological and medicalresearch; separation and characterization of glycoproteins and glycopeptides, histochemistry of cells and tissues, and thestudy of cell differentiation (
1
). Direct analysis of individual cells carrying glycoconjugate on the cell surface by flow cytometry/cell sorting should giveinvaluable information on the distribution, dynamics, and biological role of these glycoconjugates. However, native lectinswith multiple binding sites often suffer from their property to agglutinate cells in these applications. Single cell suspensionsare required for these applications to avoid the stacking problems and also for accurate measurement. To attain this, lectinsshould be used in the concentration range, in which the agglutination does not occur (
2
). This has been one of the major problems for the application of lectins in this field