“…However, use of these preparations was accompanied by numerous side-effects such as fever, rashes and cardiovascular problems, which were attributed to the polyclonal nature of the utilized antibody preparation (3,6,7). Therefore, monoclonal antibodies being directed to various cell-surface molecules became major tools for clinical immune modulation (8)(9)(10)(11)(12)(13). The functional effects may be the result of specific target-cell depletions, or of coating or modulation of the targeted surface antigens.…”