 The methodology involves simply preparing a solution of FSL construct(s) in the range of 1–1000 μg/mL, with the concentration used determining the amount of antigen present on the kodecyte.The ability to control antigen levels on the outside of a kodecyte has allowed for manufacture of quality control sensitivity systems and serologic teaching kits incorporating the entire range of serologic agglutination reactions.The actual concentration will depend on the construct and the quantity of construct required in the membrane.