Molecular Formula C18H36N6O3X2.3BrH, Poly-L-lysine with a molecular weight of >70,000. This solution is useful in promoting cell adhesion to solid substrates and used for nuclear antigen-coated red cells in hymolytic plaque assay. The 0.1% aqueous solution which is micro-filtered and is used to increase tissue adhesion to the glass slide, which is needed for immunohistochemical and immunolabeling techniques, as well as lengthy staining procedures.