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The binding of sensitized lymphocytes to tumor cells that leads to tumor cell lysis in vitro has been investigated using poly-L-lysine-fixed tumor cell monolayers and lymphocytes obtained from the anatomical site of tumor allograft rejection. The results show that magnesium is an important prerequisite for this interaction and that the extent of lymphocyte-tumor cell binding depends upon temperature as well as pH. Binding can occur in the absence of serum, although serum factors are necessary for the completion of the cytolytic process. The poly-L-lysine technique is applicable to the formation of confluent monolayers with virtually any normal or neoplastic cell type, including those that are otherwise nonadherent to surfaces. Cells immobilized by this technique can be used for the specific immunoabsorption and subsequent recovery of effector lymphocytes sensitized against transplantation or tumor cell antigens.
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